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Field
Intervention (Public)
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Before
The experiment involved 318 junior high schools. These schools were assigned, through block-randomization, to one of four groups: (1) control, (2) basic treatment, (3) treatment with an outside consultant, and (4) treatment with an outside consultant and a “relative risk” message.
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After
The experiment involved 318 junior high schools. The design is based on a two-step randomization:
- Schools were assigned, through block-randomization, to one of four groups: (1) control, (2) classic ABC education by a teacher, (3) classic ABC education by an outside consultant, and (4) ABC education + “relative risk” message by an outside consultant
- Schools were also assigned independently to two groups: (a) control, and (b) a one-hour in-class quizz on HIV prevention
This results in 8 experimental conditions : 1a, 1b, 2a, 2b, 3a, 3b, 4a, and 4b
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Field
Sample size (or number of clusters) by treatment arms
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Before
1. Control (C) = 80 schools
2. Basic Treatment (BT) = 80 schools
3. Treatment with an outside consultant (TC) = 79 schools
4. Treatment with an outside consultant and a relative risk message (TCR) = 79 schools
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After
1a. Pure Control = 40 schools
1b. In-class quizz only = 40 schools
2a. ABC message by a teacher = 40 schools
2b. ABC message by a teacher + in-class quizz = 40 schools
3a. ABC message by an outside consultant = 40 schools
3b. ABC message by an outside consultant + in-class quizz = 39 schools
4a. ABC + relative-risk message by an outside consultant = 39 schools
4b. ABC + relative-risk message by an outside consultant + in-class quizz = 40 schools
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