Table 4 Unadjusted bivariate logistic regression analysis of clinical characteristics predictive of smear negative culture positive PTB

Resp rate

> 20/min

2.5

1.3-4.8

0.005

< 20/min

1

Lymphnode

None

1

Matted

2.8

1.1-7

0.03

Discrete

1.2

0.5-2.7

0.6

Eosinophilia

< 0.4

1

> 0.4

0.5

0.2-0.8

0.01

Cavity

Abscent

1

Present

74

9.2-598

0.0001

Cavity right mid

11

0.8-139.7

0.06

Cavity other sites

NS

RBC morphology

Normocytic

1

Microcytic

0.8

0.4-1.7

0.6

Macrocytic

0.01

0.000-407516

0.7

Mixed

2

1.1-3.5

0.003