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Table 5 Number of patients needed to screen to find a new DM case among TB patients, in Hanoi, Vietnam, 2016. (n = 831)

From: Prevalence and associated factors of diabetes mellitus among tuberculosis patients in Hanoi, Vietnam

Characteristic Total TB patients evaluated for DM (n) Number of patients with previous DM (n) Number of newly diagnosed DM patients (n) Additional yield (%) Number needed to screen to diagnose a new case (n)
Total 831 64 50 43.9 17
Sex
Male 549 49 39 44.3 14
Female 282 15 11 42.3 26
Age, years
  < 40 289 4 11 73.3 26
40–65 390 45 27 37.5 14
  ≥ 65 152 15 12 44.4 13
Family history of DM
Yes 69 17 3 15.0 23
No 762 47 47 50.0 16
Type of TB
PTB - smear positive 391 40 20 33.3 20
PTB - smear negative 271 21 19 47.5 14
EPTB 169 3 11 78.6 15
BMI, kg/m2
Underweight, < 18.5 289 19 19 50.0 15
Normal, 18.5–24.9 518 38 31 44.9 17
Overweight, > = 25 24 7 0 0.0  
  1. TB Tuberculosis; PTB Pulmonary Tuberculosis; EPTB Extra Pulmonary Tuberculosis; DM Diabetes mellitus; BMI Body mass index