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The demographic characteristic of individuals
| Characteristics | Frequency (%) | Frequency (%) |
|---|---|---|
| Case | Control | |
| Sex | ||
| Female | 12 (48%) | 12 (48%) |
| Male | 13 (52%) | 13 (52%) |
| Age | ||
| ≤30 | 15 (60%) | 15 (60%) |
| ˃30 | 10 (40%) | 10 (40%) |
| Smoking | ||
| Smoker | 8 (32%) | — |
| Non‐smoker | 17 (68%) | 25 (100%) |
| Infection | ||
| Yes | 6 (24%) | — |
| No | 19 (76%) | 25 (100%) |
| Family history | ||
| Positive | 8 (32%) | 4 (16%) |
| Negative | 17 (68%) | 21 (84%) |
