Fig. 2From: Impact of universal home visits on child health in Bauchi State, Nigeria: a stepped wedge cluster randomised controlled trialTrial flow chart by allocated sequence and period. Dark blue blocks are the first year of the periods of intervention. Light blue blocks are the periods of intervention after the first year (not included in the analysis). During this period fieldworkers collected data on children born during the first period when they reached the age of 12-18 months. Grey blocks are the pre-intervention periods in waves 2, 3 and 4. HH= householdBack to article page