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Table 2 Factors related with occurrence of tuberculosis in household contacts

From: Tuberculosis burden in China: a high prevalence of pulmonary tuberculosis in household contacts with and without symptoms

  Number of IC* Number of contacts Cases in contacts Prevalence (1/100,000) OR AOR†
Index patients       
Age       
  0-14 7 12 1 8333 1.00 1.00
  15-64 1224 2568 69 2687 0.31 (0.03, 3.48) 0.40 (0.03, 1.50)
  65- 334 773 22 2846 0.33 (0.03, 3.87) 0.46 (0.04, 5.40)
Sex       
  Woman 434 967 37 3826 1.00 1.00
  Man 1141 2388 55 2303 0.59 (0.37, 0.94)‡ 0.60 (0.36, 0.99)‡
Cavitary disease       
  No 1153 2471 66 2671 1.00 1.00
  Yes 414 868 26 2995 1.12 (0.67, 1.86) 1.22 (0.72, 2.07)
Treatment history       
  New 1427 3089 80 2590 1.00 1.00
  Re-treatment 144 258 12 4651 1.75 (0.80, 3.38) 1.65 (0.45, 3.23)
Treatment delay       
  No 304 698 11 1576 1.00 1.00
  Yes 1217 2657 81 3049 1.91 (0.98, 3.73) 1.70 (0.85, 3.71)
Household contacts       
Age       
  0-14   359 4 1114 1.00 1.00
  15-64   2649 70 2643 2.28 (0.83, 6.28) 2.30 (0.84, 6.30)
  65-   342 18 5263 4.77 (1.59, 14.37)‡ 4.96 (1.85, 14.89)‡
Sex       
  Woman   1795 42 2340 1.00 1.00
  Man   1560 50 3205 1.40 (0.91, 2.14)‡ 1.52 (1.18, 2.32)‡
Symptoms       
  No   3101 46 1483 1.00 1.00
  Yes   254 46 18110 14.10 (8.91,22.31)‡ 13.94 (8.61,12.59)‡
Index patients and household contacts
Relationship       
  Couple   949 39 4110 1.00 1.00
  Parent   654 20 3058 0.73 (0.41, 1.29) 0.55 (0.20, 1.49)
  Children   939 18 1917 0.44 (0.24, 0.79)‡ 0.35 (0.12, 0.92)‡
  Sister/brother   242 10 4132 0.86 (0.39, 1.89) 0.72 (0.23, 2.28)
  Other   544 5 921 0.22 (0.08, 0.56)‡ 0.40 (0.21, 0.77)‡
Whether living same bedroom       
  No   2368 55 2323 1.00 1.00
  Yes   987 37 3749 1.70 (1.09, 2.63)‡ 1.35 (0.74, 2.50)
Random effect       
  Constant       3.08 (1.05, 9.09)‡
  1. Remark: * IC is Index Cases. †AOR is adjusted odds ratios. ‡ indicate 95% significant.