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Table 1 Presence of 2 BCG scars and two BCG vaccinations in the vaccination card in Health Unit and neighbourhood controls

From: Selection bias: neighbourhood controls and controls selected from those presenting to a Health Unit in a case control study of efficacy of BCG revaccination

 

Cases

Health Unit Controls

Neighbourhood Controls

BCG Scar

One

75 (44.4%)

180 (32.7%)

213 (44.7%)

Two

94 (55.6%)

371 (67.3%)

264 (55.3%)

Vaccination card

One

28 (33.7%)

36 (20.9%)

81 (38.9%)

Two

55 (63.3%)

136 (79.1%)

127 (61.1%)

  

VE (95%CI)

 

Vaccine efficacy

 

39% (2 to 62)

8% (-77 to 52)

  1. * Based on scar, matched and adjusted for year of birth, sex, known tuberculosis contact, water supply and income of the head of the family.