Association of meteorological parameters with intussusception in children aged under 2 years: results from a multisite bidirectional surveillance over 7 years in India.

Objectives: The study aimed to document the association between intussusception in Indian children and meteorological parameters and examine regional variations.

Design: A bidirectional (retrospective and prospective) surveillance between July 2010 and September 2017.

Setting: At 20 hospitals in India, retrospective case record review during July 2010 and March 2016 and prospective surveillance during April 2016 and September 2017 were performed.

Participants: 2161 children aged 2-24 months with first intussusception episode were included.

Interventions: The monthly mean meteorological parameters (temperature, sunshine, rainfall, humidity and wind speed) for the study sites were collected.

Methods: The association between monthly intussusception cases and meteorological parameters was examined at pooled, regional and site levels using Pearson () and Spearman's rank-order () correlation, factorial analysis of variance, and Poisson regression or negative binomial regression analyses.

Results: The intussusception cases were highest in summer and lowest in autumn seasons. Pearson correlation analysis showed that temperature (=0.056; p<0.05), wind speed (=0.134; p<0.01) and humidity (=0.075; p<0.01) were associated with monthly intussusception cases. Spearman's rank-order correlation analysis found that temperature (=0.049; p<0.05), wind speed (=0.096; p<0.01) and sunshine (=0.051; p<0.05) were associated with monthly intussusception cases. Poisson regression analysis resulted that monthly intussusception case was associated with rising temperature (North region, p<0.01 and East region, p<0.05), sunshine (North region, p<0.01), humidity (East region, p<0.01) and wind speed (East region, p<0.01). Factorial analysis of variance revealed a significant seasonal difference in intussusception cases for pooled level (p<0.05), 2-6 months age group (p<0.05) and North region (p<0.01). Significant differences in intussusception cases between summer and autumn seasons were observed for pooled (p<0.01), children aged 2-6 months (p<0.05) and 7-12 months (p<0.05).

Conclusions: Significant correlations between intussusception cases and temperature, humidity, and wind speed were observed at pooled and regional level in India. A peak in summer months was noted, which may be used for prediction, early detection and referral for appropriate management of intussusception.