Age differences in the impact of a Positive Deviance/Hearth programme on the nutritional status of children in rural Bangladesh.

OBJECTIVE

To examine the difference in the rehabilitation rate from underweight by child age at enrolment in the Positive Deviance (PD)/Hearth programme.

DESIGN

This secondary data analysis used programme monitoring records of underweight children aged 6-60 months attending a 2-week PD/Hearth session and followed up for 6 months from September 2018 to March 2019. Data were analysed using multilevel mixed-effect regression and Poisson regression with robust variance.

SETTING

Rajshahi Division, Bangladesh.

PARTICIPANTS

A total of 5227 underweight (weight-for-age Z-score (WAZ) <-2) children attended the PD/Hearth sessions.

RESULTS

From enrolment to 6 months follow-up, the mean WAZ improved from -2·80 to -2·09, and the percentage of underweight children decreased to 54·5 %. Compared to the enrolment age of 6-11 months, the estimated monthly change in WAZ at 6 months of follow-up were 0·05 lower for 12-23 months, 0·06 lower for 24-35 months, and 0·09 lower for 36-60 months of the enrolment age (all P < 0·001). The probability of rehabilitation at 6 months of follow-up were lower by 16·7 % for 12-23 months (RR = 0·83; 95 % CI 0·77, 0·91), 15·5 % for 24-35 months (RR = 0·84; 95 % CI 0·78, 0·92), and 34·9 % for 36-60 months of the enrolment age (RR = 0·65; 95 % CI 0·59, 0·72), compared to the enrolment age of 6-11 months.

CONCLUSIONS

Enrolment in the PD/Hearth programme at a younger age had the advantage of greater rehabilitation from underweight than older age. Our findings provide a better understanding of the successes and failures of the PD/Hearth programme to achieve more sustainable and cost-effective impacts.