Associations between psychosocial stress, child's anxiety, and lung function in mid-childhood.

BACKGROUND

Reducing the risk of respiratory disease during the plastic stages of lung development could have long-term health impacts. Psychosocial stress has been previously linked to adverse childhood respiratory outcomes, but the influence of child's anxiety and sex differences has not been completely elucidated.

OBJECTIVE

To evaluate the association among maternal stress, child anxiety, and lung function in children and to explore differences by sex.

METHODS

Cross-sectional analyses included 294 mother-child pairs from the Programming Research in Obesity, Growth, Environment and Social Stressors (PROGRESS) birth cohort in Mexico City. Children's lung function was tested once at ages 8 to 13 years of age, and height- and sex-adjusted z-scores were estimated for forced vital capacity, forced expiratory volume in 1 second, forced expiratory volume in 1 second/forced vital capacity and forced expiratory flow between 25% and 75%. Maternal stress was assessed through the Crisis in Family Systems-Revised (CRISYS-R) survey, used to report negative life events experienced in the past 6 months and dichotomized at the median (<3 and ≥3). Child's self-reported anxiety was assessed using the Revised Children's Manifest Anxiety Scale short form and dichotomized at the clinically relevant cutoff (T-score ≥ 60). The association among maternal stress, child anxiety, and lung function outcomes was evaluated using linear models. Effect modification by sex was evaluated with interaction terms and in stratified analyses.

RESULTS

We did not find any association between maternal stress and any lung function outcome. Clinically elevated child anxiety symptoms were associated with lower forced expiratory volume in 1 second (β = -0.36, 95% CI -0.69 to -0.02). We found no evidence of effect modification by sex.

CONCLUSION

Results highlight the importance of considering childhood mental health in relation to lung function outcomes.