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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.