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Determination of sample size
| Independent variable | Percent exposure | Calculated sample size | Total sample (allowing 10% nonresponse) |
|---|---|---|---|
| No separate kitchen | Controls, 4.8% | 168 (56:112) | |
| Cases, 20.6% | 185 | ||
| Family history of TB | Controls, 10% | 270 (90:180) | |
| Cases, 24% | 297 | ||
| >10 adults per room in household | Controls, 5% | 591 (197:394) | |
| Cases, 12% | |||
| Total | 655 |
Abbreviation: TB, tuberculosis.
