Mock 2003.

Methods	CBA (C) Allocated at level of clinics.
Participants	Upper socioeconomic stratum (SES) ‐ two private clinics Middle stratum ‐ two clinics charging low fees Lower stratum ‐ subsidised clinics
Interventions	I1 (upper) ‐ lectures and demonstrations lasting 6 hours. Use of audio visual material including The Injury Prevention Program (TIPP) I2 (middle) ‐ as above but some participants also received clinic‐based counselling I3 (lower) ‐ half hour household visits by nurses and some audio visual materials also used C = standard injury prevention counselling
Outcomes	Outcomes measured at 6 months: Functional smoke alarm Tested hot water temperature I1 = 0/25, C1 = 2/29, I2 = 0/18, C2 = 0/36, I3 = 1/27, C3 = 0/15; ORs not calculable Score of preventive behaviours ‐ Mean (SD) percent safe response scores: Upper SES I = 64.7 (12.9) pre, 72.8 (9.9) post, P < 0.001; C = 66.3 (12.8) pre, 63.9 (13.4) post, P = 0.12 Middle SES I = 60.2 (13.7) pre, 68.0 (11.5) post, P < 0.001; C = 54.3 (14.8) pre, 56.0 (15.5) post, P = 0.28 Lower SES I = 54.2 (14.9) pre, 61.8 (13.3) post, P < 0.001; C = 55.6 (16.2) pre, 59.7 (19.7) post, P = 0.09.
Notes	I1, I2 and I3 arms combined for meta‐analyses Blinding ‐ n Outcomes 80% ‐ n Balance ‐ n Intervention arm had higher percentage of safe responses at baseline than control arm
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	Not applicable ‐ non‐randomised study