Roberts 1983a.

Methods	Trial design: RCT
Participants	Number of participants: 200 randomized Inclusion criteria: volunteers who participated in a university‐sponsored TB detection drive; mostly college students Exclusion criteria: not stated
Interventions	Intervention of interest: Take‐home reminder card. Postcard reminder. Pre‐appointment telephone call. Control: Direct person‐to‐person reminder.
Outcomes	Outcomes included in this review: Number of participants who return for skin‐test reading. Outcomes not included in this review : None.
Notes	Location: USA Trial dates: not specified Baseline data: comparable Funding: Research Grants Committee, University of Alabama
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Only described as "randomised".
Allocation concealment (selection bias)	Unclear risk	Only described as "randomised".
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not specified.
Incomplete outcome data (attrition bias) All outcomes	Low risk	200/200 (100%), no missing data.
Selective reporting (reporting bias)	Low risk	All relevant outcomes in the methods section are reported in the results section.
Other bias	Low risk	None identified.