Observed prevalence of personal flotation device use in seven regions of Washington and Oregon states,1995
| Category* | No observed | Prevalence of PFD use (%) | Relative prevalence† | 95% confidence interval |
|---|---|---|---|---|
| * Some missing data for most categories. | ||||
| † Relative prevalence calculated using Mantel-Haenszel stratified relative risk methods. | ||||
| ‡ Adjusted for boat type. | ||||
| ¶ Adjusted for age category. | ||||
| All | 4181 | 25.4 | — | — |
| Age (years) | ||||
| 0–4 | 107 | 90.7 | 6.7‡ | 6.0 to 7.5 |
| 5–14 | 840 | 63.5 | 5.3‡ | 4.7 to 5.9 |
| > 14 | 3210 | 13.2 | 1.0 | Reference |
| Sex | ||||
| Female | 1450 | 31.4 | 1.5 | 1.3 to 1.6 |
| Male | 2686 | 21.2 | 1.0 | Reference |
| Boat type | ||||
| Sailboat | 114 | 50.0 | 2.3¶ | 2.0 to 2.8 |
| Rowboat | 400 | 27.0 | 1.3¶ | 1.1 to 1.5 |
| Canoe | 396 | 40.9 | 2.2¶ | 2.0 to 2.5 |
| Kayak | 107 | 77.6 | 5.5¶ | 4.9 to 6.2 |
| Raft | 96 | 31.3 | 1.1¶ | 0.8 to 1.5 |
| Motorboat | 2640 | 19.0 | 1.0 | Reference |
| Water type | ||||
| Salt water | 354 | 31.6 | 1.1‡ | 0.9 to 1.3 |
| Lake | 2690 | 25.5 | 0.8‡ | 0.7 to 1.0 |
| River | 1137 | 23.2 | 1.0 | Reference |
| Weather | ||||
| Cloudy | 102 | 20.6 | 0.8 | 0.6 to 1.2 |
| Partly cloudy | 598 | 29.6 | 1.2 | 1.0 to 1.4 |
| Sunny | 3389 | 24.8 | 1.0 | Reference |
| Temperature (°F) | ||||
| < 65 | 769 | 26.5 | 1.0‡ | 0.8 to 1.4 |
| 65–80 | 3068 | 25.4 | 1.0‡ | 0.9 to 1.2 |
| > 80 | 285 | 21.8 | 1.0 | Reference |