This study aimed to determine whether psychological flexibility acts as a moderating variable in the effects of PMDD symptoms on negative parenting, positive parenting, depressive symptoms, and anxiety symptoms in mothers of children aged 0–3 years. Results indicated that psychological flexibility moderated the impact of PMDD symptoms, particularly on anxiety and positive parenting.
From the initial sample of 2,000 mothers raising children between the ages of 0 and 3 years, the analysis focused on 1,538 menstruating mothers. For the analysis of negative and positive parenting behaviors, we further narrowed the sample to 1,261 parents of children aged 1–3 years, as the item content related to parenting did not apply to 0-year-old children. We examined the differences in scale scores (PAAQ, HADS-D, HADS-A, PMDD, negative parenting, and positive parenting) across various parent-child attributes, including the number of children, employment status, birth order, and child age.
Results exhibited no significant differences in depression, anxiety, or PMDD symptoms based on these attributes. However, differences were found in negative parenting, positive parenting, and psychological flexibility. Specifically, psychological flexibility was lower among unemployed parents compared to those on parental leave, and it was also lower among parents raising 2- and 3-year-olds compared to those with younger children. Additionally, parents on parental leave or in full-time employment, parents raising one child, and those raising younger children were less likely to engage in negative parenting behaviors. Parents on parental leave were more likely to engage in positive parenting than unemployed parents, and those raising their second child were more likely to engage in positive parenting than those raising their first child.
In Japan, several studies have highlighted the parenting stress experienced by mothers raising infants and toddlers [39]. Research has shown that unemployed mothers often feel more isolated and are more prone to losing their sense of identity [40]. Additionally, mothers raising 2- and 3-year-olds report greater stress related to managing anger and aggression toward their children compared to mothers of 1-year-olds [41]. This heightened stress may stem from children entering the "terrible twos" or primary rebellious period, during which their behavior becomes more defiant and argumentative [42]. Consequently, mothers’ psychological flexibility may decrease, making them more prone to engaging in negative parenting behaviors.
Based on these findings, mothers in Japan are more likely to increase their psychological flexibility, engage in less negative child-rearing behaviors, and engage in more positive child-rearing behaviors when they have social ties, such as child-rearing leave, compared to when they are unemployed. The number and age of children are also very important, and mothers raising two or three children or raising two- or three-year-olds are more likely to engage in negative parenting behaviors and need more support.
Pearson’s correlation coefficients were calculated for each scale score: the HADS-D, HADS-A, PAAQ, negative parenting, positive parenting, and PMDD-total. 44), negative parenting and the PAAQ (r = .44), and HADS-A and the PAAQ (r = .54) showed moderate positive correlations. Miyaoka et al. [37] surveyed menstruating 20- to 45-year-olds (of whom 37% were women with children) and found a moderate positive correlation (r = .54) between PMDD symptoms and depression, which is consistent with the results of this study. Brassell et al. [43] found that raising 3- 5-year-old 210 subjects and found moderate (r = .40) and weak (r = .25) correlations between the AAQ-II, which measures psychological flexibility in general, not just parenting, negative parenting, and positive parenting. Fonseca et al. [44] studied 250 mothers with children aged 2–12 years and found moderate correlations between the AAQ-II and anxiety and depression (r = .43, r = .47) and moderate correlations with a parenting style that uses corporal punishment (authoritative) (r=-.46). For the PAAQ, which measures psychological flexibility related to parenting used in this study, the moderate correlation with negative parenting is consistent with previous studies. By contrast, positive parenting was not correlated with the PAAQ in the present study, whereas in a previous study [43], permissive parenting style and AAQ-II were weakly correlated. This may be because in positive parenting, given that PAAQ functioned as a regulating variable, there were many surplus variables, although related, that did not show up in the correlation.
We examined whether the PAAQ functions as a moderating variable for PMDD and depression, anxiety, and positive and negative parenting and found that it is a moderating variable for anxiety and positive parenting. When PMDD symptoms were high, psychological inflexibility resulted in higher anxiety and less Positive Parenting; when PMDD symptoms were low and psychological inflexibility was present, anxiety was low, and Positive Parenting was increased. Additionally, for those with low PMDD symptoms, Positive Parenting was not influenced by psychological flexibility, whereas for those with high PMDD symptoms, Positive Parenting was highly influenced by psychological flexibility; if inflexible, Positive Parenting was not possible. This indicates that even mothers with PMDD symptoms can be positively involved with their children if they have high psychological flexibility.
Depression and negative parenting were associated with higher psychological flexibility regardless of PMDD symptoms. These findings indicate that PMDD symptoms do not influence depression or negative parenting, even when controlling for child and maternal attributes, but rather psychological flexibility. Although few studies have examined maternal psychological flexibility and nurturing behaviors during infancy, a study by Brassell et al. [43] of 210 mothers raising 3- to 5-year-olds found that parental role-specific psychological flexibility had a strong influence on adaptive nurturing behaviors and harsh discipline practices, a moderate negative impact on lax discipline practices and negative parenting, and a weak positive impact on positive parenting. The influence of psychological flexibility on nurturing behaviors is similar to the results of the present study. In a study conducted on 250 mothers with children aged 2–12 years [44], even after controlling for anxiety and depression, distress about the parenting role positively affected authoritative parenting style through the mediation of psychological flexibility and authoritarian parenting style, and negatively affected permissive parenting style (authoritative parenting style and authoritarian parenting style also had a direct effect on distress about parenting roles). (Authoritative and authoritarian parenting styles also directly affected distress related to parental roles). The fact that psychological flexibility was a mediating variable in this study, as positive parenting is a concept similar to authoritative parenting style and negative parenting is similar to authoritarian parenting style, is similar to the results of the present study, the results are similar to those of the present study.
Therefore, in mothers raising children aged 0 to 3 years, increased psychological flexibility positively influences maternal mental health and nurturing behaviors. The findings of this study further suggest that even among mothers with high PMDD symptoms, greater psychological flexibility may help reduce anxiety and promote positive parenting. Given that approximately 18% of the mothers in this study were diagnosed with PMDD or PMS, providing psychological support to enhance psychological flexibility is crucial, as one in five mothers is affected by hormonal fluctuations.
In Japan today, possible facilities for working with mothers raising children aged 0–3 include day-care centers, local childcare centers, and gynecology departments for the treatment of PMDD. Among them, obstetrics and gynecology departments that provide one-month checkups, pediatrics departments that provide checkups for 0-year-olds, and health centers that provide checkups for 1–6 months and 3-year-olds may be more likely to offer programs related to mothers' mental health. In the future, early intervention and prevention programs using ACT programs should be subject to empirical studies to increase psychological flexibility and prevent negative parenting.
4.1 Limitations
The first limitation of this study is its cross-sectional design, which limits the ability to infer causal relationships. While the direction of associations explored in the adjustment model aligns with prior literature, the influence of psychological flexibility and its moderating effects were only examined within this framework. Without testing these relationships in a longitudinal design, definitive conclusions about causality cannot be drawn. Future longitudinal studies on PMDD symptoms, psychological flexibility, nurturing behaviors, and emotional problems are essential for a clearer understanding of these dynamics.
A second limitation is the exclusive focus on mothers. Emotional problems in mothers have been linked to their relationships with their partners, their support systems, and their children's developmental characteristics. Future studies should investigate whether mothers of children with developmental disorders, such as autism, fit within the model used in this study. This would require controlling for factors such as marital relationships, support networks, and other contextual influences.
A third limitation is the low Cronbach's α coefficient for the depression subscale of the HADS (α = .59-.61). While some researchers in the social sciences consider a Cronbach's α above .60 acceptable [45], the recommended threshold is generally .70 or higher. Therefore, caution is warranted when interpreting these results. The HADS was used in this study because it measures both anxiety and depression, but future research should consider using scales with higher reliability and validity when assessing depressive symptoms.