Crude OR | (95% CI) | Adj. OR | (95% CI) | χ2 | |
Wave factor*, m×s | 22.8 | ||||
<5.2 | Ref. | Ref. | |||
5.2–9.2 | 3.89 | (2.03 to 9.81) | 6.41 | (2.93 to 18.3) | |
>9.2 | 1.96 | (1.01 to 4.50) | 7.10 | (3.09 to 22.7) | |
Wave incidence factor* | 1.83 | (1.40 to 2.62) | 2.27 | (1.58 to 3.70) | 13.2 |
Cloud cover†‡ | 0.52 | (0.37 to 0.74) | – | ||
Air temperature*, °C | 43.0 | ||||
≤21 | Ref. | Ref. | |||
21–23.5 | 6.58 | (3.03 to 19.2) | 4.79 | (1.93 to 16.6) | |
>23.5 | 19.10 | (9.62 to 61.8) | 12.20 | (4.69 to 52.3) | |
Water temperature*, °C | |||||
≤19.5 | Ref. | – | |||
19.5–21.3 | 3.95 | (2.13 to 9.14) | |||
>21.3 | 13.18 | (7.60 to 27.0) | |||
Wind speed†, m/s | |||||
≤4.3 | Ref. | – | |||
4.3–6.3 | 1.71 | (1.00 to 3.14) | |||
>6.3 | 0.84 | (0.45 to 1.66) | |||
Season | 10.4 | ||||
Low | Ref. | Ref. | |||
High | 7.17 | (4.38 to 13.5) | 3.98 | (1.44 to 6.11) | |
Type of day | 17.1 | ||||
Weekday | Ref. | Ref. | |||
Weekend | 1.73 | (0.71 to 3.62) | 2.96 | (1.06 to 7.98) | |
Holidays | 5.77 | (3.49 to 10.8) | 4.25 | (2.19 to 9.75) |
Univariate and multivariate analyses performed with the aid of logistic regression models using retrospective data from 2011 to 2013.
*Daily maximal value.
†Daily mean value.
‡Not incorporated into multivariate analyses because of differences in measurement modes.