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Table 2 Assessment of the prisons environment, incarcerated time and number of prisoner in a particular prison room compared with smear positive pulmonary tuberculosis infection among North Gondar Zone prisons, February—April 2015

From: Smear positive pulmonary tuberculosis and HIV co-infection in prison settings of North Gondar Zone, Northwest Ethiopia

Variables Sputum Microscopy result
  Smear + ve
n (%)
Smear -ve
n (%)
Total COR
(95 % Cl)
P-Value Adjusted
OR (95 % Cl)
P-value
Incarcerated time (Month)
  < 2 2 (13.3) 25 (9.4) 27 (9.6) 1   1 1
 2–6 3 (20) 55 (20.6) 58 (20.6) 0.68 (0.11–4.330 0.685 1.54 (0.12–10.30) 0.970
 7–12 2 (13.3) 63 (23.6) 65 (23) 0.40 (0.05–2.97) 0.36 0.79 (0.06–5.65) 0.624
  > 12 8 (53.4) 124 (46.4) 132 (46.8) 0.81 (0.16–0.53) 0.029 1.02 (0.11–5.26) 0.759
Frequency of imprisonment
 Once 14(93.3) 258(96.6) 272(96.5) 1   1 1
 Twice and above 1 (6.7) 9 (3.4) 10 (3.5) 2.05 (0.24–17.31) 0.511 10.52(0.78–142.10) 0.062
Number of prisoners per cell
  < 50 2 (13.3) 55 (20.6) 57 (20) 1   1 1
 51–100 1 (6.7) 73 (27.3) 74 (26) 0.38 (0.03–4.26) 0.43 0.19 (0.01–2.90) 0.006
  > 100 12 (80) 139(52.1) 151(53.5) 2.37 (0.52–10.95) 0.048 3.32 (3.29–8.51) 0.002*
Window opening practice      
 Always 6 (40) 108(40.4) 114 (40.4) 1   1 1
 Some times 0 (0) 11 (4.12) 11 (3.9) NC 0.99 NC 0.202
 Never 9 (60) 148(55.5) 157 (5 5.7) 1.09 (0.37–3.17) 0.028 11.28 (2.25–56.7) 0.003*
  1. TB pulmonary tuberculosis, OR odds ratio, CI Confidence interval, COR Crude odds ratio, NC Not computed due to small numbers
  2. +ve = positive; -ve = negative
  3. *P 0.05 (significance level)