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Table 1 Description of WASH Benefits trial interventions, fidelity measures and benchmarks, Bangladesh, 2012–2015

From: WASH Benefits Bangladesh trial: system for monitoring coverage and quality in an efficacy trial

Interventionsa Provided to eligible householdsb Fidelity measuresc (benchmark for uptakec)
Water quality Free supply of chlorine tablets (Aquatabs® brand, sodium dichloroisocyanurate) with a 10-L insulated water storage container (Fig. 1a)
Storage container, N = 2160
Tablets: 64,800/month
Presence of chlorine in stored water detected using a HACH color-wheel colorimeter (> 0.2 mg/L) (HACH LANGE GmbH, USA) (65%)
Sanitation Double-pit improved latrine; sani- scoop, a locally developed tool for child and animal feces handling and disposal (Sultana et al.); potties (Faruqe) (Fig. 1b)
Latrine installed: 4533
Child potty: 4384
Sani-scoop: 6303
Reported location and method of disposal for child’s last bowel motion (65%)
Spot check for sani-scoop that easily accessible to mother (80%)
Spot check for visible potty (easily accessible to mother) (80%)
Spot check of designated household latrines; a functional water seal (80%)
Handwashing A handwashing station comprised of a bucket with a fitted tap (40 L near the latrine and 16 L near the cooking area), a soapy-water bottle (Hulland et al. [18]) and free bi-weekly supply of detergent for soapy-water preparation (Fig. 1c)
Station for latrine and kitchen: 4320
Spot check for handwashing location near the toilet and the cooking area, and for the presence of water and soap (65% with at least one with soap and water present)
Child nutrition Promotion of exclusive breastfeeding up to 6 months of age, complementary feeding and supplementation using lipid-based nutrient supplements (LNS; Nutriset, France) for children aged 6–24 months (Fig. 1d).
Total sachets distributed: 1,579,900
Reported messages on infant/child nutrition and/or lipid- based nutrient supplements (LNS) local name; Sonamoni (80%)
Inspection of number of sachets of Sonamoni for children > 6 months of age, consistent with use of 2 sachets per day (70%)
  1. aCombined arms: The interventions were delivered sequentially in the following order: sanitation, handwashing. Water treatment, with a minimum of 21 days between each start date. LNS was delivered when the child reaches 6 months of age; fidelity indicators and benchmarks as for individual components; beligible households were those directly enrolled by the study in the individual water, handwashing, and nutrition arms. For arms that received the sanitation intervention, interventions were provided to all households in the compound of the index household; potties were provided to all households in the compound of the index household who had children too young to use a latrine. cbased on unannounced visits by the Fidelity Assessment Team; does not include hardware replacements made during the course of the trial