Respirator-type failure by sex: contingency table and analysis
| Male | Female | ||
| 3M 1870 respirator | |||
| Pass | 52 | 80 | P=0.072 |
| Fail | 3 | 16 | RR=0.33 |
| Total | 55 | 96 | (CI 0.10 to 1.07) |
| Help-It P2 respirator | |||
| Pass | 18 | 60 | P=0.005 |
| Fail | 30 | 35 | RR=1.7 |
| Total | 48 | 95 | (CI 1.20 to 2.39) |
| 3M 1860 respirator | |||
| Pass | 27 | 36 | P=0.570 |
| Fail | 5 | 10 | RR=0.73 |
| Total | 32 | 46 | (CI 0.27 to 1.90) |
RR, relative risk.