Letter to the editor regarding the comment by Gupta and Goswami about our article "individual and household risk factors of severe acute malnutrition among under-five children in Mao, Chad: a matched case-control study".

We would like to thank the authors Sunanda Gupta and Kiran Goswami for their interest in our article "Individual and household risk factors of severe acute malnutrition among under-five children in Mao, Chad: a matched case-control study". In this response we aim to address their criticisms.

Individual and household risk factors of severe acute malnutrition among under-five children in Mao, Chad: a matched case-control study.

BACKGROUND: Severe acute malnutrition (SAM) is one of the leading causes of morbidity and mortality in Chad. The reasons behind persistently high prevalence of SAM in the Kanem region are still poorly understood, leaving national and international partners without clearly identified drivers to address. Current knowledge of SAM determinants in this context is largely based on very limited data. The aim of this study was thus to investigate individual and household-level risk factors for SAM among under-five children in Mao health district. METHODS: A matched case-control study was conducted on 411 (137 cases and 274 controls) children aged 6-59 months with their caretakers from mid-February to August 2017. Data were collected by using a structured interviewer administered questionnaire, anthropometric measurements and through direct observations of household environment. Controls were matched to their cases on place of residence and on age (± 3 months). Data were double-entered, processed and analysed using Epi Info 7.2.0.1. Conditional logistic regression was used to analyse the association of independent variables with SAM. For multivariable analysis, two models were constructed to investigate risk factors for SAM, at individual and household level. A stepwise backwards elimination approach with a significance level of p = 0.05 was used to build the final models. RESULTS: At the individual level, SAM was significantly associated with diarrhoea [AOR (95% CI) = 10.7 (4.2-27.3)], fever [AOR (95% CI) = 8.4 (3.1-22.8)], vomiting [AOR (95% CI) = 7.6 (3.0-19.7)], being stunted [AOR (95% CI) = 5.3 (1.7-16.3)], and type of complementary meal [AOR (95% CI) = 4.4 (1.0-19.6)]. At the household level, SAM was significantly associated with undernourished caretaker [AOR (95% CI) = 2.6 (1.2-5.5)], caretaker's hand washing habits [AOR (95% CI) = 1.9 (1.2-3.1)], absence of toilet [AOR (95% CI) = 1.9 (1.1-3.6)], caretaker's marriage status [AOR (95% CI) = 7.7 (2.0-30.1)], and low household food diversity [AOR (95% CI) = 1.8 (1.0-3.1)]. CONCLUSION: The present study identified the need to address both treatment and prevention of infections in children through an integrated approach. Well-organized efforts to improve child feeding practices, household hygiene and sanitation conditions, women's nutritional status, along with increasing household food diversity are likely to lead to improved nutritional status of children in this setting.

Effectiveness of a Household Water, Sanitation and Hygiene Package on an Outpatient Program for Severe Acute Malnutrition: A Pragmatic Cluster-Randomized Controlled Trial in Chad.

Water, sanitation and hygiene (WASH) interventions have a small but measurable benefit on stunting, but not on wasting. Our objective was to assess the effectiveness of a household WASH package on the performance of an Outpatient Therapeutic feeding Program (OTP) for severe acute malnutrition (SAM). We conducted a cluster-randomized controlled trial embedded in a routine OTP. The study population included 20 health centers (clusters) from Mao and Mondo districts in Chad. Both arms received the OTP. The intervention arm received an additional household WASH package (chlorine, soap, water storage container, and promotion on its use). The primary objective measures were the relapse rates to SAM at 2 and 6 months post-recovery. The secondary objectives included the recovery rate from SAM, the time-to-recovery, the weight gain, and the diarrhea longitudinal prevalence in OTP. The study lasted from April 2015 to May 2016. Among the 1,603 recruited children, 845 were in the intervention arm and 758 in the control arm. No differences in the relapse rates were noticed at 2 (-0.4%; P = 0.911) and 6 (-1.0%; P = 0.532) months. The intervention decreased the time-to-recovery (-4.4 days; P = 0.038), improved the recovery rate (10.5%; P = 0.034), and the absolute weight gain (3.0 g/d; P = 0.014). No statistical differences were noticed for the diarrhea longitudinal prevalence (-1.7%; P = 0.223) and the weight gain velocity (0.4 g/kg/d; P = 0.086). Our results showed that adding a household WASH package did not decrease post-recovery relapse rates but increased the recovery rate among children admitted in OTP. We recommend further robust trials in other settings to confirm our results.