6. Results from trials of complex interventions compared to control.

Study	Comparison (see Table 4 for details of interventions)	Reported outcomes	Results
Complex hygiene and sanitation interventions compared to control
Chard 2019 cluster‐RCT Laos	Complex sanitation intervention and education vs none	Pupil‐reported symptoms of respiratory infection over 1 week	NS difference between groups. 29% of intervention group; 32% control group; adjusted risk ratio 1.08 (95% CI 0.95 to 1.23)
Hartinger 2016 cluster‐RCT Peru	Cooking and sanitation provision and education vs none	Number of ARI episodes per child‐year	NS difference between groups. Risk ratio for intervention to control 0.95 (95% CI 0.82 to 1.10)
Huda 2012 cluster‐RCT Bangladesh	Sanitation provision and education vs none	Respiratory illness	12.6% in intervention group; 13.0% in control group. Not adjusted for multiple outcome measurements. No CIs reported.
Najnin 2019 cluster‐RCT Bangladesh	Sanitation and behaviour change intervention (plus cholera vaccine) vs none	Respiratory illness in past 2 days	2.8% in intervention group; 2.9% in control group

ARI: acute respiratory infection
CI: confidence interval
cluster‐RCT: cluster‐randomised controlled trial
NS: non‐significant
RCT: randomised controlled trial
vs: versus