Table 5 Multivariate analysis of clinical characteristics predictive of smear negative culture positive PTB

Respiratory rate

> 20/min

2.4

1.2-4.4

0.0054

< 20/min

1

Eosinophilia

< 0.4

1

> 0.4

0.5

0.2-0.8

0.0094

Cavity

Abscent

1

Present

74.3

9.4-587

0.0000

RBC morphology

Normocytic

1

Microcytic

0.8

0.4-1.7

0.6

Macrocytic

0.01

0.000-39171193

0.69

Mixed

2

1.2-3.7

0.01