Effects of mother–child interaction on school adaptation of children according t

Hnn Lee, Jeong-Won Hn*

aDepartment of Nursing, Gangneung-Wonju National University, Gangwon-do 26403, Korea

bCollege of Nursing Science, Kyunghee University, Seoul 1240, Korea

Abstract: Objective: Factors influencing school adaptation of school-aged children include both executive function (EF) and parent-child interaction. This study aims to investigate the developmental trajectory of mother-child interaction longitudinally using latent growth model analysis.

Keywords: child · depression · interactions · school

1. Introduction

As children spend most of their time at school, the socialization function of the family has been transferred to the school and children’s school adaptation, which has become an important domain in relation to their social adaptation during adulthood.1School adaptation is important for children, as it is used as a flexible coping resource for adapting to various human relationships and social life in adulthood.2Additionally, since unsuccessful school adaptation can lead to dropping out from school and suicide during adolescence, and may lead to the development of family welfare and social problems that extend beyond personal problems, and therefore, school adaptation of school-aged children requires attention.1Previous studies on school adaptation of schoolaged children have focused mainly on personal, family, and school factors. Specifically, gender, age, academic performance, and self-esteem have been reported as the personal factors affecting children’s school

adaptation, while family structure, communication with parents, parenting attitude, and family cohesion have been identified as the family factors.3-5

However, EF has recently been emphasized as a personal factor affecting school adaptation of school-aged children. EF is defined as the conscious cognitive processes that control goal-oriented thinking, behavior, and emotions in human beings, and as the thinking process used for solving various problems and performing adaptive behaviors in daily life and learning situations.6EF generally consists of suppression, cognitive flexibility, and working memory.7Suppression is the ability to intentionally control behaviors, thoughts, and responses that are automatically and predominantly performed. Cognitive flexibility is the ability to switch attention easily while performing tasks, to proficiently move between tasks and goals, and to process various data simultaneously. Working memory refers to the ability to continue tasks or ideas even while relevant information is being rapidly added and removed. EF continuously develops during childhood, which is a period of rapid growth, and is closely related to the development of the frontal lobe. As cognitive development continues until the beginning of adulthood, EF of school-aged children becomes an important factor that influences not only their school adaptation as children, but also their social adaptation as adults.8Previous studies have reported that EF is strongly associated with academic performance; achievements related to reading, mathematics, and science; and self-regulation related to learning and school life.9,10Therefore, research on the EF of school-aged children is important to improve children’s school adaptation by minimizing the learning, emotional, and behavioral problems because of EF disorders.

Along with the importance of EF, a personal factor, the importance of parent-child interaction as a family factor determining school adaptation of school-aged children has also been emphasized.11Parent-child interaction is related to the development of the frontal lobe in children, since it supports their behavior and is a source of linguistic stimulation. Therefore, it is also a factor that increases children’s EF.12,13A previous study on twins12considered the influence of parent-child interaction on children’s EF and showed that children’s self-regulation ability decreased when parents’ sensitivity to interaction with children was low. Additionally, a study13on toddlers showed that parental behavior and emotional tone appear to be especially influential on exuberant children’s effortful control development.

Furthermore, the interaction between parents and children can be affected by parents’ emotional problems. As parental depression has been reported to reduce the interaction between parents and children that influencing negatively children’s EF, and hence interventions for parental depression are important to improve parent-child interaction.14-17Specifically, the role of depression was explained in Barnard’s mother-child interaction model, as the author contended that maternal traits and environmental characteristics influence the health and development of children when they interact with children’s traits.18In 2007, McGrath et al.19also reported that maternal depression negatively influences mother-child interaction and this influence continues until children reach school age. Furthermore, in a prospective longitudinal study conducted in 2008, Pawlby et al.20found that the incidence of school-aged children’s mental health problems was four times higher when mothers had postpartum depression than when they did not. Thus, the importance of early intervention for mothers with depression is emphasized. It is also indicated that intervention for mother-child interaction must be approached according to the level of maternal depression.

However, depressive symptoms and motherchild interaction do not develop within a short period. Importantly, as the interactions from a child’s birth onward influence his/her EF and school adaptation, it is important to approach and create interventions for mother-child interaction with a long-term rather than a short-term perspective.21Most studies have not considered the level of maternal depression nor comprehensively assessed mother-child interaction, EF, and school adaptation. Furthermore, they have only conducted cross-sectional investigations at one point rather than conducting longitudinal examinations. Therefore, even findings of a partial relationship are limited as basic data required for improving children’s school adaptation. Eventually, research on children’s school adaptation must comprehensively investigate the personal and family factors involved. In addition, the rate of longitudinal change in the interaction between parents and children must be determined and the effects of such a change on children’s EF and school adaptation must be identified.

Therefore, this study determines the effect of mother-child interaction over time on school-aged

children’s school adaptation, treating EF difficulties of the children as a mediating factor. In addition, it attempts to provide basic data for the development of individualized intervention plans to improve school adaptation in school-aged children by using research models for investigating the two levels of maternal depression, a factor that especially affects motherchild interaction.

2. Material and Methods

2.1. Study design

This study is a longitudinal descriptive survey study conducted to determine the relationship between the developmental trajectory of mother-child interaction, children’s EF difficulties, and school adaptation using the Panel Study on Korean Children.

2.2. Participants

The Panel Study on Korean Children (conducted by the Korea Institute of Child Care and Education) used in this study provided longitudinal survey data on neonates born in 2008 and their mothers and local community environment. The participants in this study were mothers aged 20 years or older and their children, who had participated in the 6th (2013) to the 8th (2015) panel surveys. The Panel Study on Korean Children targeted all households in which a baby was born between April and July 2008 at sampled medical institutions with 500 or more annual deliveries in 2006 was included in the sample and excluding those who declined to participate in the survey. In total, 2,562 households were willing to participate in the panel survey and they were recruited for the pilot sample and 2,150 households with a newborn baby were selected for the final sample. The sampling for the Panel Study on Korean Children was conducted using a stratified multi-stage sampling technique in which medical birthing institutions were selected in the first stage and the households with babies born at the selected medical institutions were selected as the pilot sample in the second stage. The final sample was drawn from the pilot sample households that were willing to participate in the panel survey in the third stage. The sample maintenance rate of the 2008 sample determined per the suggestion of the survey team of the Panel Study on Korean Children for the validity of the sample was 77.3% in the 6th panel survey (2013), 75.3% in the 7th panel survey (2014), and 74.3% (2015) in the 8th panel survey (2015). The final participants in this study comprised of 1,614 mothers who participated in the 6th through the 8th panel surveys and the survey of mothers and their children. Previous studies14-17of mothers and children have found correlations between the levels of depression of mothers and children, and found that the presence or absence of mother’s depression affects children’s behavior. Hence, for the present study, only those mothers whose depression was consistently at mild or higher levels or within the normal range for the previous three years of the 6th through the 8th survey periods were selected as participants.

2.3. Measurement

2.3.1. Depression

Depression was measured using an abbreviated instrument developed in 2002 by Kessler et al.22for the U.S. National Health Interview Survey to assess the mental health of the public. The instrument consists of six items, each measured on a five-point Likert scale, with higher scores indicating higher levels of depression. Depression is classified as within the normal range (6-13 points), mild/moderate (14-18 points), or severe (19-30 points). In this study, depression level was classified into within the normal range, or mild or higher. The reliability of the instrument measured by Cronbach’s α by Kessler et al. (2002) was 0.89, and the equivalent figures obtained in this study for the 6th, 7th, and 8th panel surveys were 0.89, 0.91, and 0.90, respectively.

2.3.2. Mother-child interaction

Mother-child interaction was measured using an instrument developed in the Early Childhood Longitudinal Study conducted by the National Center for Education Statistics, which is translated by the research team of the Panel Study on Korean Children, and tested for validity by the survey team of the Early Childhood Longitudinal Study. The instrument consists of nine items, each measured on a four-point Likert scale, with higher scores indicating higher levels of mother-child interaction. In this study, Cronbach’s α for the 6th, 7th, and 8th panel surveys were found to be 0.84, 0.83, and 0.84, respectively.

2.3.3. EF difficulty

EF difficulty was measured using an instrument developed by Song in 2014.23The instrument consists of 40 items categorized in four sub-areas (planning-organizing difficulty, behavior control difficulty, emotional control difficulty, and attention-concentration difficulty). Each item is measured on a three-point Likert scale, with higher scores indicating higher levels of EF difficulty. The reliability of the instrument as measured by Cronbach’s α by Song23was 0.95, and the value obtained in this study was 0.98 for the 8th panel survey.

2.3.4. School adaptation

School adaptation was measured using the school adaptation inventory developed by Chi and Jung in 200624for first-grade elementary school students. The inventory consists of 35 items categorized in four sub-areas (school adaptation, academic performance adjustment, peer adjustment, and teacher adaptation). Each item is measured on a five-point Likert scale, with higher scores indicating higher levels of school adaptation. The reliability of the inventory measured by Cronbach’s α by Chi and Jung24was 0.98, and the value measured in this study was 0.96 for the 8th panel survey.

2.3.5. Ethical considerations

2.3.6. Data collection and analysis

A research plan for obtaining required data was submitted to the Panel Study on Korean Children operated by the Korea Institute of Child Care and Education through its homepage and reviewed by the same. The panel study was conducted in accordance with the process of the Institutional Bioethics Committee of the Child Rearing Policy Institute. Data were collected from February 22 to March 10, 2018. The data received did not contain sensitive data from which personal information could be identified. Data analysis was carried out after applying the longitudinal weights recommended by the Panel Study on Korean Children. Further, descriptive statistics were computed using SPSS WIN 23.0 to identify the general characteristics of the participants. The reliability of the instruments used was assessed using Cronbach’s α. Skewness and kurtosis were obtained through data normality testing. It was determined whether their absolute values were less than 3 and 10, respectively, so that the Full Information Maximum Likelihood method—a parameter estimation method that accounts for missing data—could be used.25In addition, the correlations between the variables were checked to determine their multicollinearity. Further, models were designed using latent growth modeling with AMOS 17.0 to estimate changing patterns in mother-child interaction over time. The significance of initial values and the rate of change were determined for the changing patterns in mother-child interaction over time and the final selection of the most appropriate model was made by comparing the goodness of fit of the no-change and linear-change models. The goodness of fit of the model was determined using chi-square (χ2), the normed fit index (NFI) ≥0.90, the relative fit index (RFI), the incremental fit index (IFI), the Tucker Lewis Index (TLI), the comparative fit index (CFI) ≥0.90, and the root mean square error of approximation (RMSEA) ≤0.10.25Also, the influence of the developmental trajectory of mother-child interaction on EF difficulty and school adaptation was determined by testing the significance of the path coefficients to identify the relationships between the variables. Finally, bootstrapping was performed to determine the mediating effect of EF difficulty between the developmental trajectory of mother-child interaction and school adaptation.

3. Results

3.1. General participant characteristics

Based on the results of the 8th survey of the Panel Study on Korean Children, the average maternal age was 37.89 years; 749 participants (49.2%) had attained an educational level of a four-year college degree or higher, making it to the most prevalent education level in the sample; 720 participants (44.6%) were employed or in school; 894 participants (55.4%) were full-time homemakers; and the average monthly household income was KRW4.6299 million. The average age of the children was 80.0 months; 815 children (50.5%) were male, and 799 children (49.5%) were female.

3.2. Correlations between factors and changes in each factor by time of mother-child interaction

To determine the changing patterns of mother-child interaction over time and the level of children’s EF difficulty and school adaptation, average values were calculated. Mother-child interaction tended to gradually decrease over time. Furthermore, the average scores for EF difficulty and school adaptation were 1.30 and 3.96 points, respectively. According to the results of the skewness and kurtosis, calculations performed to test the normality of each factor and, the normality assumption was satisfied as the absolute values of skewness and kurtosis were less than 3 and 10, respectively (Table 1). The correlations between the factors were all significant at the 0.05 level (Table 2).

3.3. Test of construct validity by factor analysis

Construct validity was tested for validation, as abstract constructs are frequently used in research models for structural equation models. To determine construct validity, confirmatory factor analysis was performed to test the convergent validity and discriminant validity asa method of assessing whether constructs have been correctly measured. Maximum likelihood estimation was performed using AMOS 23.0 (SPSS Korea Data Solution Inc.) for the confirmatory factor analysis. During the convergent validity analysis, a total of four items (the first item in the 6th, 7th, and 8th surveys of mother-child interaction, “Read a book to the child,” and the 11th item for school adaptation, “Behaves younger than age”) were eliminated. Convergent validity was confirmed, as the average variance extracted (AVE) values were 0.62 to 0.91, which were greater than the criteria of 0.50, and the construct reliability values were 0.87 to 0.98, which

were greater than the criteria of 0.70. Discriminant validity shows the difference between different latent variables. The √AVE values and correlation coefficients of the two constructs were compared. Discriminant validity was confirmed, as the √AVE values of the latent variables were between 0.78 and 0.95, which were greater than the correlation coefficients between the latent variables (Table 2).

Table 1. Descriptive statistic of variables (N = 1614).

Table 2. Correlations and changes in each factor by time.

3.4. Estimation of the goodness of fit of the latent growth model and developmental trajectories of mother-child interaction

The goodness of fit of the no-change and linear models was determined to test the statistical significance of the changing patterns of mother-child interaction according to the level of maternal depression, and to determine the best model for changing trends. According to the results, a linear model (χ2= 4.45, df = 3, NFI = 0.99, RFI = 0.99, IFI = 0.99, TLI = 0.99, CFI = 0.99, and RMSEA = 0.01) is appropriate for the group of mothers whose depression is within the normal range. The hypothesis stating that the average initial value of mother-child interaction with 0 was rejected, as the initial value of the mother-child interaction was 2.30 (p ＜ 0.001) and the individual difference in the initial value of the mother-child interaction was statistically significant. Mother-child interaction decreased as each year passed, with an average rate of change of -0.11 (p ＜ 0.001). The rate of change also demonstrated individual differences, with an average variance of 0.17 (p ＜ 0.001). The correlation between the initial value of mother-child interaction and the rate of change was -0.30 (p ＜ 0.001), indicating that the higher the initial value of the mother-child interaction, the slower the reduction of the mother-child interaction level over time (Table 3).

A linear model (χ2= 4.30, df = 3, NFI = 0.96, RFI = 0.94, IFI = 0.98, TLI = 0.98, CFI = 0.99, and RMSEA = 0.03)was also found to be appropriate for the group of mothers with mild or higher depression levels. The hypothesis stating that the average initial value of mother-child interaction with 0 was rejected, as the initial value of mother-child interaction was 2.14 (p ＜ 0.001) and the individual difference in the initial value of the motherchild interaction was statistically significant. Motherchild interaction decreased as each year passed, with an average rate of change of -0.09 (p ＜ 0.001). The rate of change also demonstrated individual differences, with an average variance of 0.11 (p ＜ 0.001). The correlation between the initial value of mother-child interaction and the rate of change was found to be -0.64 (p ＜ 0.001), indicating that the higher the initial value of the motherchild interaction, the slower the reduction of the motherchild interaction level over time (Table 3).

Table 3. Trajectories of the variables.

3.5. Analysis of mother-child interaction, executive function difficulty, and school adaptation using a multivariate latent growth model

The longitudinal relationship between mother-child interaction, EF difficulty, and school adaptation was tested by dividing the participants based on the depression level. One group included mothers having depression within the normal range and the other included mothers having mild or higher-level depression. The goodness of fit of the model for the normal-range maternal depression group was χ2= 5.76, df = 5, NFI = 0.99, RFI = 0.99, IFI = 0.99, TLI = 0.99, CFI = 0.99, and RMSEA = 0.01. Furthermore, out of five paths, only the path by which the change rate of mother-child interaction affected school adaptation of school-aged children was statistically nonsignificant (t = 1.007, p = 0.314). The goodness of fit of the model for the mild or higher-level maternal depression group was χ2= 7.15, df = 5, NFI = 0.96, RFI = 0.96, IFI = 0.98, TLI = 0.96, CFI = 0.98, and RMSEA = 0.03. Furthermore, out of five paths, only the paths by which the initial value of mother-child interaction influenced EF difficulty (t = -2.75, p = 0.032) and EF difficulty influenced school adaptation (t = -7.876, p ＜ 0.001) were statistically significant (Table 4).

4. Discussion

This study identifies the changing patterns in motherchild interaction over time, using data from the 6th to the 8th surveys of the Panel Study on Korean Children, and longitudinally analyzes the relationship between EF difficulties and school adaptation of school-aged children. The results and the management implications of this study are described below.

Table 4. Effects of predictive variables on endogenous variables in the model.

First, mother-child interaction tended to decrease over time for both the groups (normal range maternal depression and mild or higher-level maternal depression). Furthermore, significant individual differences were found. It means that the mother-child interaction over time does not change in the same pattern for everyone, but in various patterns depending on the individual. The decreasing trends found are similar to the findings of Hallers-Haalboom et al.’s26study in 2017 which investigated childcare sensitivity according to the age of children. They reported that the increase in childcare sensitivity was the highest during infancy to toddlerhood, but decreased as the children grew from toddlerhood to early childhood. Thus, it appears that interaction with children decreases to a certain degree, as mothers’ childcare sensitivity decreases as their children grow. Especially in South Korea, children spend more time in childcare centers and interact more with teachers and siblings than with their mothers. Additionally, as mother-child interaction decreased most slowly over time when its initial value was higher, whereas the change in mother-child interaction was more rapid when the initial value was lower, and so the importance of promoting initial interaction along with implementing individual approaches to improving mother-child interaction was confirmed. In 2016, Chang et al.27conducted a family checkup intervention—a parent-child interaction promotion program. They reported that the program should be adopted when children are 2 to 5 years old to promote parent-child interaction. They added that such early adoption influences the effortful control of 5-year-old children and influences the peer acceptance of 7.5 to 10-year-old children. These findings emphasize that mother-child interaction is effective when early diagnosis and individualized long-term interventions are implemented. So, it is important to implement early intervention through appropriate diagnosis, especially for families experiencing mother-child interaction difficulty, and to provide continuous support to promote children’s development and prevent future difficulty.

Second, the results of the multivariate latent growth model analysis showed that the initial value of motherchild interaction affected EF difficulty regardless of the level of maternal depression. This finding is similar to that of a previous study28conducted with parents of infants, which reported that interactions between children and parents play a vital role in the development of EF abilities in children. Other studies14-17on mothers with depression have also reported that mother-child interaction influences EF difficulty, which is similar to the findings of the present study. In light of the results of this and previous studies, the importance of early mother-child interaction for the improvement of children’s EF is acknowledged and the need for a social support system is identified.

Third, the change rate of mother-child interaction significantly affected the children’s EF difficulties in the normal-range maternal depression group, whereas the same was not observed in the mild or higher-level maternal depression group. This finding is different from those of previous studies,14-17which reported that parent-child interaction negatively influenced children’s EF when a parent had depression. As most studies are cross-sectional investigations centered on data obtained at one point, it is difficult to compare their findings with this study. Since the emotions of mothers whose depression level is within the normal range are stable, early mother-child interaction positively affects children even as time passes. As maternal depression levels do not change over a short period and children’s perceptions of their mothers’ depressive symptoms have long-term influences on their interactions,29the latter is an important factor in the development of children’s EF.

Fourth, the initial value of mother-child interaction and the value of the rate of change had a significant influence on children’s school adaptation in the normalrange maternal depression group. However, the same was not observed in the mild or higher-level maternal depression group. Although it is necessary to pay attention to the former finding, the latter suggests that although the mother-child interaction does not directly influence children’s school adaptation for mothers with mild or higher levels of depression, this influence is significant when EF is considered as a mediator. This finding appears to be related to the parenting attitude of mothers with mild or higher levels of depression. Previous studies have shown that mothers with depression use negative parenting behaviors due to their distorted perceptions of their children’s behaviors caused by their negative emotions. Due to mothers’ attitudes, such as negligence, blaming, and rejection, children have little opportunity to satisfy their need for affection, resulting in the reduction of positive mother-child interactions.4,30Ultimately, this appears to affect children’s development of EF, which negatively influences their school adaptation. Therefore, mother-child interaction education is necessary for mothers with mild or higher levels of depression, as it is, in turn, expected to positively influence children’s EF. Most importantly, the improvement in children’s EF promoted by increasing initial interaction with the mother may improve school adaptation automatically.

Fifth, the children’s EF difficulties significantly influenced their school adaptation regardless of the maternal depression level. This finding agrees with many previous studies,3,5which reported that EF is related to school adaptation and to various aspects of cognitive development in children and adolescents. EF is highly related to academic performance; achievements related to reading, mathematics, and science; and self-regulation related to learning and school life.9,10This study confirms that the EF difficulties of school-aged children negatively influence their school adaptation. Therefore, it is important to develop interventions by identifying the factors affecting children’s EF. Related to this context, a previous study3investigated EF and its change according to age showed that children’s EF improves up to 15 years of age. However, since EF improvement slows down after that age after that, early involvement of parents and the society is important for preventing children’s EF difficulties.

Suggestions for future research are as follows. First, an in-depth analysis on the direct and indirect influences of various variables affecting mother-child interaction, including maternal depression, is needed. Second, this study only investigated changes over three years using data from the 6th through 8th surveys of the Panel Study on Korean Children. As mother-child interaction is expected to vary when children reach adolescence, it is recommended that a comprehensive examination and in-depth analysis of the relationships and causality pertaining to changes in mother-child interaction and their influence on EF and school adaptation should be conducted by exploring data from more temporal points. Third, this study only examines the mother-child interaction relationship. Future research may confirm the research models of parent-child interaction by including fathers.

5. Conclusions

The significance of this study lies in its attention to the changing patterns of mother-child interactions, EF, and the trajectories of change in school adaptation from a longitudinal perspective using nationwide data rather than interpreting numerical values at a specific point. This study confirms its research models by dividing mother-child interaction into two groups based on the level of maternal depression (normal range and mild or higher-level depression). Furthermore, contrary to previous studies in which mothers have been included in a single group, the findings of this study can serve as basic data for providing individualized interventions for mother-child interaction in the future. Therefore, it is necessary to accurately evaluate the initial value of mother-child interaction and its changing patterns in the process of children becoming healthy adult members of society in order to identify people experiencing difficulties with mother-child interaction (such as mothers with depression), and to provide early interventions. Moreover, management and intervention for high-risk groups (as identified by testing for depression during prenatal tests) are necessary, and the programs delivered by trained experts that can regularly assess mother-child interaction and psychological state should be implemented. Developing and implementing intervention programs to improve mother-child interaction will positively influence children’s school adaptation and improve their EF.

Ethical approvalData were provided by the Panel Study on Korean Children after deliberation and the study was conducted after receiving a waiver for ethical approval (1040271-201801-HR-001) from the Institutional Review Board (IRB) of Changwon National University.

Conflicts of interest

All contributing authors declare no conflicts of interest.