Table 3.
Homogeneity analysis of variables related to DUI before and after BAC limit change
| Before BAC limit change | After BAC limit change | Crude OR (95% CI) |
P value | |||||
| DUI | Non-DUI | OR (95% CI) | DUI | Non-DUI | OR (95% CI) | |||
| Gender, n (%) | 0.952 | |||||||
| Male | 331 (9.75) | 1710 (50.37) | 6.05 (4.35 to 8.40) | 237 (5.85) | 2097 (51.75) | 5.96 (4.09 to 8.66) | 6.01 (4.69 to 7.69) | |
| Female | 42 (1.24) | 1312 (38.65) | 32 (0.79) | 1686 (41.61) | ||||
| Mortality, n (%) | 0.568 | |||||||
| Alive | 360 (10.60) | 2997 (88.28) | 4.33 (2.20 to 8.54) | 252 (6.22) | 3738 (92.25) | 5.60 (3.16 to 9.93) | 4.98 (3.21 to 7.73) | |
| Death | 13 (0.38) | 25 (0.74) | 17 (0.42) | 45 (1.11) | ||||
| Time, n (%) | <0.001 | |||||||
| 06:00–14:00 | 46 (12.33) | 1305 (43.18) | 1 | 24 (8.92) | 1798 (47.53) | 1 | ||
| 14:00–22:00 | 139 (37.27) | 1297 (42.92) | 3.04 (2.16 to 4.28) | 110 (40.89) | 1498 (39.60) | 5.50 (3.52 to 8.60) | ||
| 22:00–06:00 | 188 (50.40) | 420 (13.90) | 12.70 (9.03 to 17.85) | 135 (50.19) | 487 (12.87) | 20.76 (13.30 to 32.41) | ||
| Car, n (%) | 0.007 | |||||||
| Airbag | 19 (59.38) | 54 (75.00) | 0.49 (0.20 to 1.18) | 6 (33.33) | 55 (62.50) | 0.30 (0.10 to 0.88) | ||
| No airbag | 13 (40.63) | 18 (25.00) | 12 (66.67) | 33 (37.50) | ||||
| Motorcycle, n (%) | <0.001 | |||||||
| Helmet | 261 (76.54) | 2615 (88.64) | 0.42 (0.32 to 0.55) | 172 (68.53) | 3388 (91.69) | 0.20 (0.15 to 0.26) | ||
| No helmet | 80 (23.46) | 335 (11.36) | 79 (31.47) | 307 (8.31) | ||||
| Seasons, n (%) | 0.456 | |||||||
| Spring | 63 (16.89) | 542 (17.94) | 1 | 72 (26.77) | 922 (24.37) | 1 | ||
| Summer | 98 (26.27) | 776 (25.68) | 1.09 (0.78 to 1.52) | 55 (20.45) | 953 (25.19) | 0.74 (0.51 to 1.06) | 0.96 (0.75 to 1.22) | |
| Autumn | 94 (25.20) | 876 (28.99) | 0.92 (0.66 to 1.29) | 69 (25.65) | 893 (23.61%) | 0.99 (0.70 to 1.39) | 1.00 (0.79 to 1.27) | |
| Winter | 118 (31.64) | 828 (27.40) | 1.23 (0.89 to 1.70) | 73 (27.14) | 1015 (26.83) | 0.92 (0.66 to 1.29) | 1.12 (0.89 to 1.42) | |
| Weekdays, n (%) | <0.001 | |||||||
| Sunday | 73 (19.57) | 364 (12.05) | 1 | 51 (18.96) | 432 (11.42) | 1 | ||
| Monday | 40 (10.72%) | 447 (14.79%) | 0.45 (0.30 to 0.67) | 41 (15.24%) | 598 (15.81%) | 0.58 (0.38 to 0.89) | ||
| Tuesday | 45 (12.06) | 508 (16.81) | 0.44 (0.30 to 0.66) | 27 (10.04) | 531 (14.04) | 0.43 (0.27 to 0.70) | ||
| Wednesday | 47 (12.60) | 393 (13.00) | 0.60 (0.40 to 0.88) | 38 (14.13) | 549 (14.51) | 0.57 (0.38 to 0.91) | ||
| Thursday | 50 (13.40) | 444 (14.69) | 0.56 (0.38 to 0.83) | 29 (10.78) | 561 (14.83%) | 0.44 (0.27 to 0.70) | ||
| Friday | 46 (12.33) | 434 (14.36) | 0.53 (0.36 to 0.78) | 35 (13.01) | 578 (15.28) | 0.51 (0.33 to 0.80) | ||
| Saturday | 72 (19.30) | 432 (14.30) | 0.83 (0.58 to 1.18) | 48 (17.84) | 534 (14.12) | 0.76 (0.50 to 1.15) | ||
*Breslow-Day statistic.
BAC, blood alcohol concentration; DUI, driving under the influence.