The graph below is from the study by Yokley and Glenwick (1984) on the immunisation of pre-school children. intervention period first follow-up period second follow-up period 30 - 25 - cumulative percentage of children receiving one or more inoculations across time periods 20 - 15 - 10 - 5 - 0 1 2 3 4 5 6 7 8 9 10 11 12 week Key to different conditions — general prompt --- specific prompt -.-.- specific prompt plus increased access -.-.-.- specific prompt plus monetary incentive •• pooled control groups [Figure 3.1]
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