Relationship between Receipt of the Samples of Breast Milk Substitutes in Hospitals and Breastfeeding Practice in Japan.

Objective: This study estimated the percentage of mothers who received samples of breast milk substitutes at medical facilities and examined the relationship between receipt of the samples and breastfeeding practices in Japan. Methods: We used the data from the "The Japan COVID-19 and Society Internet Survey (JACSIS)" conducted in 2021. Two groups of mothers were analyzed: mothers 0-5 months postpartum (n = 1,412) and mothers 5-12 months postpartum (n = 2,045). Logistic regression analysis was conducted with the practice of exclusive breastfeeding as the dependent variable and the receipt of the sample as the explanatory variable. Exclusive breastfeeding was defined in different ways for each group: "exclusive breastfeeding under five months" as measured by 24-hour recall for mothers 0-5 months postpartum, and "exclusive breastfeeding for the first five months" as defined by asking mothers 5-12 months postpartum when they first fed infant formula or baby food and when they finished breastfeeding. Results: The proportion of mothers who received the samples was 82.4%. We found that mothers who received the samples were found to be less likely to continue "exclusive breastfeeding under five months" (odds ratio: 0.71, 95% confidence interval [CI]: 0.51-0.98). In addition, a similar trend was found in a subsample analysis restricted to mothers who intended to breastfeed during pregnancy (odds ratio: 0.62, 95% CI: 0.40-0.94). Conclusions: This study showed that more than 80% of mothers had received the samples of breast milk substitutes, and that receipt of the samples decreased the probability of their practicing exclusive breastfeeding. Regulating distribution of the samples at medical facilities is necessary to prevent interruptions of exclusive breastfeeding.

Age-specific prevalence of IgG against measles/rubella and the impact of routine and supplementary immunization activities: A multistage random cluster sampling study with mathematical modelling.

BACKGROUND: Vietnam continues to have measles and rubella outbreaks following supplementary immunization activities (SIA) and routine immunization despite both having high reported coverage. To evaluate immunization activities, age-specific immunity against measles and rubella, and the number of averted Congenital Rubella Syndrome (CRS) cases, must be estimated. METHODS: Dried blood spots were collected from 2091 randomly selected individuals aged 1-39 years. Measles and rubella virus-specific immunoglobulin G (IgG) were measured by enzyme immunoassay. Results were considered positive at ≥120 mIU/mL for measles and ≥10 IU/mL for rubella. The number of CRS cases averted by immunization since 2014 were estimated using mathematical modelling. RESULTS: Overall IgG seroprevalence was 99.7% (95%CI: 99.2-99.9) for measles and 83.6% (95%CI: 79.3-87.1) for rubella. Rubella IgG seroprevalence was higher among age groups targeted in the SIA than in non-targeted young adults (95.4% [95%CI: 92.9-97.0] vs 72.4% [95%CI: 63.1-80.1]; P < 0.001). The estimated number of CRS cases averted in 2019 by immunization activities since 2014 ranged from 126 (95%CI: 0-460) to 883 (95%CI: 0-2271) depending on the assumed postvaccination reduction in the force of infection. CONCLUSIONS: The results suggest the SIA was effective, while young adults born before 1998 who remain unprotected for rubella require further vaccination.

Identifying distinct subtypes of mother-to-infant bonding using latent profile analysis in a nationwide Japanese study.

BACKGROUND: Mother-to-infant bonding (MIB) is foundational for nurturing behaviors and an infant's development. Identifying risk factors for difficulties or problems in MIB is vital. However, traditional research often dichotomizes MIB using cutoff thresholds, overlooking its underlying complexities. This research utilizes latent profile analysis (LPA) to discern MIB subtypes in a nationwide Japanese dataset. METHODS: We conducted LPA on data from the Mother-to-Infant Bonding Scale (MIBS), collected from 3,877 postpartum women within one year of childbirth. To empirically validate the derived profiles, we examined their associated risk factors, focusing on sociodemographic, health, and perinatal variables. RESULTS: Four distinct MIB profiles emerged. Profile 1 indicated minimal difficulties, while Profile 4 exhibited severe multifaceted difficulties. Profiles 2 and 3 showed moderate difficulties distinguished by lack of positive affection and presence of negative affection (especially indifference), respectively. Compared to Profile 1, women in Profiles 2-4 had a higher likelihood of postpartum depression and low family support. Each profile also presented unique risk factors: medium family support in Profile 2, maternal working status in Profile 3, and pre-pregnancy underweight status in Profile 4. Notably, both Profiles 3 and 4 were also linked to increased feelings of loneliness since the onset of the COVID-19 pandemic. CONCLUSION: This study represents the first application of LPA to MIB, revealing distinct subtypes and their respective risk profiles. These insights promise to enhance and personalize early interventions for difficulties in MIB, affirming the necessity of acknowledging MIB's heterogeneity.

Mother-to-infant bonding difficulties are associated with future maternal depression and child-maltreatment behaviors: A Japanese nationwide longitudinal study.

BACKGROUND: Mother-to-infant bonding difficulties (MIBD) are considered risk factors for postpartum depression and child-maltreatment behaviors. However, few longitudinal studies have examined this hypothesis. This study aims to explore the relationship between MIBD and subsequent maternal depression and child-maltreatment behaviors using longitudinal data from a 2021 Japanese nationwide survey. METHODS: We studied 658 first-time mothers who had given birth within the past year and had not reported postpartum depression or child-maltreatment behaviors at baseline. The Japanese version of Mother-to-Infant Bonding Scale (MIBS) was used to measure MIBD. Subjects were monitored for six months and subsequently completed the Edinburgh Postnatal Depression Scale and responded to inquiries about child-maltreatment behaviors. RESULTS: After adjusting for covariates, MIBD was associated with higher odds of maternal depression (OR=1.737, 95 % CI [1.078, 2.797]) and child-maltreatment behaviors (OR=2.040, 95 % CI [1.401, 2.970]) six months later. Further analysis indicated that MIBD was particularly associated with a heightened risk of emotional abuse (OR=2.172, 95 % CI [1.486, 3.176]). Sensitivity analysis confirmed these findings through multiple approaches, such as applying inverse probability weighting to mitigate selection bias, using an alternative MIBS cutoff score of 5, and adopting a time-varying model to account for the dynamic nature of depressive symptoms and child-maltreatment behaviors. CONCLUSION: Proactive screening for MIBD could serve as a valuable tool in the early detection of maternal depression and potential child-maltreatment behaviors.

Postpartum loneliness predicts future depressive symptoms: a nationwide Japanese longitudinal study.

PURPOSE: The COVID-19 pandemic has intensified feelings of loneliness, especially among postpartum women. This nationwide Japanese longitudinal study assessed the impact of such feelings on depressive symptoms and mother-to-infant bonding difficulties (MIBD), two pivotal determinants of maternal and infant well-being. METHODS: Starting with a baseline survey conducted between July and August 2021, we tracked 1254 postpartum Japanese women who initially reported minimal depressive symptoms (i.e., Edinburgh Postnatal Depression Scale < 9) and MIBD (i.e., Mother-to-Infant Bonding Scale < 5), over a follow-up period of approximately 6 months. Baseline loneliness was evaluated with the UCLA Loneliness Scale Short-Form (UCLA-LS3-SF3). RESULTS: Forty-nine percent of the sample reported the presence of baseline feelings of loneliness. After propensity score matching on sociodemographics and various pregnancy, childbirth, and COVID-19-related aspects, baseline loneliness was associated with increased risks of later depressive symptoms but not MIBD. Using restricted cubic spline logistic regression and considering loneliness as a continuous variable, we found a positive increasing quadratic relationship with depressive symptoms. As loneliness increased, so did the risk of later depressive symptoms. However, there was no significant association between loneliness and MIBD. These results were confirmed through a sensitivity analysis using inverse probability weighting to address attrition bias. CONCLUSION: Feelings of postpartum loneliness are associated with future risks of depressive symptoms. The data suggests that addressing loneliness in postpartum women early is crucial to safeguarding their well-being and that of their infants.

Risk factors for persistent versus episodic mother-to-infant bonding difficulties in postpartum women in a nationwide Japanese longitudinal study.

BACKGROUND: The quality of mother-to-infant bonding (MIB) is a crucial determinant of nurturing behaviors and infant development, with bonding difficulties (MIBD) posing a substantial threat. While it is essential to identify MIBD risk factors, previous studies have generally examined MIBD at one time point, leaving the contributors to persistent MIBD uncertain. This study aims to discern longitudinal risk factors for persistent versus episodic MIBD. METHODS: We evaluated 1833 postpartum Japanese women who delivered in the past twelve months, utilizing the Mother-to-Infant Bonding Scale (MIBS) and other sociodemographic, health, pregnancy, childbirth, and child-rearing related data (T1). Follow-up data were obtained six months later (T2). MIBD was defined as a MIBS score of five or more, with "persistent" and "episodic" MIBD classified based on its occurrence at both or either one of the time points, respectively. Logistic generalized estimating equations and inverse probability weighting were used to identify risk factors and address selective attribution bias. RESULTS: Of the subjects, 15.8 % reported episodic and 11.3 % reported persistent MIBD. Shared risk factors for both conditions included postpartum depression and low levels of family support (OR = 1.501-6.343). However, pre-pregnancy underweight status (OR = 1.698) was a unique risk factor for episodic MIBD, while first-time motherhood, no or discontinuation of breastfeeding, and later postpartum months (OR = 1.540-3.179) were distinctive risk factors for persistent MIBD. CONCLUSION: We identified both shared and unique risk factors for episodic and persistent MIBD. Particular attention should be afforded to persistent MIBD and early and proactive interventions to mitigate identified risk factors are recommended.

Sex differences in the association between socioeconomic status and untreated hypertension among residents with hypertension in rural Khánh Hòa, Vietnam: a post-hoc analysis.

BACKGROUND: Several studies have examined the association between socioeconomic status (SES) and the proportion of untreated hypertension, but have produced conflicting findings. In addition, no study has been conducted to determine sex differences in the association between SES and untreated hypertension. Thus, the aim of this study was to examine whether the associations between SES and the proportion of untreated hypertension differed by sex in Vietnam. METHODS: This study was conducted using the data of 1189 individuals (558 males and 631 females) who were judged to have hypertension during the baseline survey of a prospective cohort study of 3000 residents aged 40-60 years in the Khánh Hòa Province. A multilevel Poisson regression model with a robust variance estimator was used to examine whether sex and SES indicators (household income and educational attainment) interacted in relation to untreated hypertension. RESULTS: The proportion of untreated hypertension among individuals identified as hypertensive was 69.1%. We found significant interaction between sex and SES indicators in relation to untreated hypertension (education: p < 0.001; household income: p < 0.001). Specifically, the association between SES and untreated hypertension was inverse among males while it was rather positive among females. CONCLUSIONS: Our finding suggests that the role of SES in the proportion of untreated hypertension might differ by sex.

Challenging the utility of 24-hour recall of exclusive breast feeding in Japan.

INTRODUCTION: WHO recommends exclusive breast feeding from birth to 6 months. However, to monitor populations, it recommends using the proportion of infants under 6 months who were exclusively breastfed during the previous 24 hours. To assess the usefulness of 24-hour recall, we (1) compared the prevalence of exclusive breast feeding measured by since-birth recall to the prevalence measured by 24-hour recall and (2) quantified each indicator's association with WHO-recommended, well-established methods for in-hospital breastfeeding support. METHODS: We conducted two online surveys of mothers in Japan (total n=4247) who had a healthy singleton delivery in the previous 25 months. They reported on their breast feeding (a) from birth to 5 months; or (b) during the previous 24 hours, for those with infants under 5 months; or (c) both, for those who participated in the initial survey and also in the follow-up survey. All mothers also reported on their in-hospital support. The strength of each indicator's association with provision of in-hospital support was quantified as the area under the curve (AUC). RESULTS: The prevalences of exclusive breast feeding by since-birth recall were 4.4% (first survey) and 2.5% (second survey). By 24-hour recall, the prevalence appeared to be 29.8%. More in-hospital support was moderately well associated with more exclusive breast feeding measured by since-birth recall: AUC 0.72 (95%CI 0.66 to 0.78). That association is consistent with the known benefits of in-hospital support. In contrast, when exclusive breast feeding was measured by 24-hour recall, its association with in-hospital support appeared to be extremely weak: AUC 0.59 (95% CI 0.54 to 0.65). CONCLUSION: Using 24-hour recall substantially overestimates the prevalence of exclusive breast feeding since birth, and it conceals the benefits of in-hospital breastfeeding support. To monitor population achievement of exclusive breast feeding for the first 6 months, or to evaluate breastfeeding interventions, 24-hour recall of exclusive breast feeding should not be used alone.

Factors associated with father-infant bonding during the COVID-19 pandemic: an internet-based cross-sectional study in Japan.

The COVID-19 pandemic has forced lifestyles changes and affected the relationships between fathers and their infants. However, the factors associated with paternal-infant bonding have not been clarified. This study aimed to explore the factors associated with father-infant bonding during the COVID-19 pandemic in Japan. This cross-sectional study used data from a nationwide survey and the Japanese version of the Mother-to-Infant Bonding Scale (MIBS) to measure father-infant bonding. The participants were divided into two groups depending on their partners' parity. A linear regression model (Gauss-Markov-type) was used for both groups. A total of 1055 men were included in the analysis. Of these men, 521 (49.4%) had a primipara partner, and 534 (50.6%) had a multipara partner. No significant differences were found between the two groups' MIBS-J scores. Fathers' mental health, relationship with the partner and family members, abusive behavior towards children, wanted pregnancy, and the youngest child's Neonatal Intensive Care Unit admission history were associated with father-infant bonding. Regarding factors related to COVID-19, caring for the child while the partner is at home has a negative impact on bonding, while fear related to infection with COVID-19 has no negative impact on bonding.

The prevalence and risk factors of suicidal ideation in women with and without postpartum depression.

AIM: Suicidal ideation (SI) is a severe mental health issue in the postpartum period. As depression is a major risk factor of SI, it is often considered that the risk factors of SI are the same as those of postpartum depression. However, SI occurs in women without postpartum depression as well. The aim of this study is to separately examine the prevalence and risk factors of SI in postpartum women with and without depression. METHODS: We used data of 5688 postpartum women from a 2021 Japanese nation-wide survey, whose age and geographical distributions were nationally representative. Postpartum depression was evaluated with the Edinburgh Postnatal Depression Scale (EPDS) and SI was measured with the 10th item of EPDS. RESULTS: The prevalence of SI in women with and without depression (EPDS≥9) was 51.8 % and 3.3 %, respectively. Younger age and low family support were risk factors common to both women with and without depression. Being single, currently working, history of depressive disorders, and family members' visits to support being cancelled were risk factors of SI for women with depression. In contrast, primipara, history of psychiatric disorders other than depressive disorders, infectious disease other than colds during pregnancy, and feeling of loneliness increased since COVID-19 were risk factor of SI for women without depression. CONCLUSION: Although with a low prevalence, SI occurs in women without postpartum depression, which has unique risk factors indicating distinct psychopathological mechanisms. These findings call for tailored SI intervention strategies according to whether postpartum depression is present or not.

The diagnostic accuracy of the Edinburgh Postnatal Depression Scale without the self-harm item.

The Edinburgh Postnatal Depression Scale (EPDS) is the most commonly used screening tool for perinatal depression. However, the 10th item of the EPDS intended to evaluate suicide ideation does not accurately capture suicide ideation and may cause psychological distress. Whereas endorsement of the strongest agreement "yes, quite often" on this item may be associated with suicide ideation, the response on this frequency is perfectly predicted by the EPDS full score. The discard of this item, therefore, is preferred. In the current study, using data from a nation-wide internet survey conducted in Japanese postpartum (n = 5688) and pregnant women (n = 1639), we show that the EPDS-9 without the 10th item correlates perfectly with the full EPDS or EPDS-10. Furthermore, the EPDS-9 and EPDS-10 have equivalent performance in differentiating participants' self-reported depression diagnosis as well as Kessler Psychological Distress Scale (K6)-based screening of depression. Lastly, at the cutoff of 9, the EPDS-9 performs well in predicting participants' response on the 10th item of EPDS; specifically, the sensitivity of differentiating frequent thoughts of self-harm is 0.968 and 1 in postpartum and pregnant women, respectively. Therefore, the EPDS-9 performs equivalently to EPDS-10 and can be considered to replace EPDS-10 in future use.