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Table 1 Demographic characteristics of the study population stratified by period

From: Yield of close contact tracing using two different programmatic approaches from tuberculosis index cases: a retrospective quasi-experimental study

   Period  
Characteristics   2001-2004 n = (810) 2005-2008 n = (1310) p value
Age (mean ± DP)   38 (±16) 37 (±15) 0.2
Gender Male 513 (63.6%) 762 (58.4%) 0.02
  Female 297 (36.4%) 548 (41.6%)  
Index case AFB positive yes 609 (75. 2%) 962 (73. 4%) 0.3
  no 201 (24. 8%) 348 (26. 6%)  
Index case HIV positive yes 4(0. 4%) 5 (0.3%) 0.9
  no 801 (99. 6%) 1284 (99. 7%)  
Contact households yes 634 (78. 3%) 785 (59. 9%) <0.001
  no 176 (21. 7%) 525 (40. 1%)  
Smoking yes 82 (10.2%) 94 (7,2%) 0.01
  no 722 (89.8%) 1210 (92,8%)  
Use of injectable drugs yes 2 (0. 2%) 12 (0.9%) 0.1
  no 801 (99.8%) 1286 (99. 1%)  
Use of non-injectable drugs yes 17 (2.1%) 23 (1.8%) 0.6
  no 786 (97.9%) 1281 (98.2%)  
Residing in poor areas(slum) yes 121 (16.0%) 216 (18.2%) 0.2
  no 635 (84.0%) 971 (81.8%)  
Prisoners/previous hospitalization yes 28 (3.5%) 36 (2.8%) 0.4
  no 776 (96.5%) 1267 (97.2%)  
Diabetes mellitus yes 22 (2.7%) 16 (1.2%) 0. 01
  no 783 (97.3%) 1294 (98.8%)  
Alcohol abuse yes 19 (2. 4%) 45 (3.4%) 0.2
  no 786 (97. 6%) 1262 (96.5%)  
Use of immunosuppressive drugs yes 4 (0. 5%) 4 (0.3%) 0.4
  no 801 (99.5%) 1299 (99.7%)  
  1. Statistical test used for all variables was Chi-square, except for comparing age mean (Student).