Table 2. Multivariate analysis of the factors associated to the diagnosis of pulmonary TB, and the scoring for each variable, in HIV-infected adults and suspected smear-negative pulmonary TB, in Pernambuco, Brazil, 2007–2010.

Variables	OR (95%-CI)	p-value	β	New score*	% PDA%***
Model					68.2
Clinical Symptoms					88.4
Cough**
No	1.0	–		0 points
Yes	3.96 (1.95–8.05)	0.000	1.38	14 points	66.0
Weight loss
No	1.0	–		0 points
Yes	2.44 (1.43–4.15)	0.001	0.89	9 points	43.9
Fever
No	1.0	–		0 points
Yes	1.99 (1.22–3.23)	0.005	0.69	7 points	25.3
Malnutrition
No	1.0	–		0 points
Yes	2.62 (1.51–4.54)	0.001	0.96	10 points	18.6
Related to diagnostic methods for TB					62.0
Radiological pattern
Normal	1.0	–	–	0 points
Typical/Atypical	9.14 (5.33–15.7)	0.000	2.21	22 points
Scar	2.81 (1.32–5.96)	0.007	1.03	10 points	59.4
No X-ray	0.93 (0.43–2.01)	0.851	–
Tuberculin test
Non-reactor	1.0	–	–	0 points
Reactor	4.03 (1.63–9.98)	0.003	1.39	14 points	6.5
Not undertaken	2.64 (1.49–4.70)	0.001	0.97	10 points
Related to HIV					42.1
CD4 T cell count
≥200	1.0	–	–
<200	3.19 (1.82–5.57)	0.000†	1.16	12 points	42.1

*To optimize the rounding off of the score, the regression scores were multiplied by 10.

**For people living with HIV and suspected smear-negative pulmonary TB, whose criteria on entering the study was weight loss.

*** Population diagnosis attributed percent - percent of diagnosis attributed to a factor or group of factors.

Sample size 1276 individuals.