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Table 2 Distribution of biological features, contact with Tb and socio-economic characteristics in HU 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

Variables Health Unit Control Neighbourhood P value
  % %  
Sex      0.063
   Male 210 38.1 209 43.8  
   Female 341 61.9 268 56.2  
Tb contact      0.520
   Yes 72 13.1 56 11.7  
   No 479 86.9 421 88.3  
Head of family employed      0.026
   Yes 400 72.6 315 66.2  
   No 151 27.4 161 33.8  
Income of the head of family      0.152
   <1 MW* 31 5.63 33 6.92  
   1 to <2MW 103 18.69 88 18.45  
   2 to <5MW 45 8.17 30 6.29  
   ≥ 5MW 28 5.08 12 2.51  
   No reported or not known 344 62.43 314 65.83  
Piped water      <0.001
   Yes 503 91.5 467 98.5  
   No 47 8.5 07 1.5  
Washing machine      0.007
   Yes 134 24.3 81 17.3  
   No 417 75.7 386 82.7  
Frigidaire      0.929
   Yes 507 92.0 429 91.9  
   No 44 8.0 38 8.1  
Videocassette      0.088
   Yes 221 40.1 163 34.9  
   No 330 59.9 304 65.1  
  1. *MW: the income level of the head of the family was relative to the minimum wage (MW). MW<1 was the baseline. 1–1.9+ = US$100–US$199/month; 2–4.9 = US$200–US$499/month; 5+ = US$>=US$500/month.