Radiological and smoking characteristics of study sample (n = 520)
| Number | % | 95% CI | |
|---|---|---|---|
| 95% CI, 95% confidence interval; CXR, chest x ray. | |||
| PTB on history | 101 | 19.4 | 16.0 to 22.8 |
| CXR prevalence of PTB—Reader 1 | 143 | 27.5 | 23.6 to 31.4 |
| CXR prevalence of PTB—Reader 2 | 90 | 17.3 | 14.0 to 20.6 |
| Prevalence of PTB on history or CXR—either reader | 183 | 35.2 | 31.1 to 39.3 |
| Silicosis 1/1 or greater—Reader 1 | 94 | 18.3 | 15.0 to 21.9 |
| Silicosis 1/1 or greater—Reader 2 | 102 | 19.9 | 16.5 to 23.6 |
| Silicosis 1/0 or greater—either reader | 147 | 28.2 | 24.4 to 32.2 |
| Ever smokers | 267 | 51.3 | 47.0 to 55.7 |
| Current smokers | 150 | 28.8 | 24.9 to 32.8 |
| Ex-smokers | 117 | 22.5 | 18.9 to 26.1 |