Table 2. Comparison of risk factors between older and younger drivers.
| Total drivers (n = 37,511) |
Older drivers (n = 2,361) |
Younger driver (n = 35,150) |
P value | ||||
|---|---|---|---|---|---|---|---|
| Sex, male | 24,544 (65.4%) | 1,896 (80.3%) | 22,648 (64.4%) | <0.001 a | |||
| Age b | 41 (32–52) | 69 (67–73) | 40 (31–50) | <0.001 b | |||
| Time of injury | <0.001 a | ||||||
| Morning | 9,368 (25.0%) | 737 (31.2%) | 8,631 (24.6%) | ||||
| Afternoon | 11,844 (31.6%) | 986 (41.8%) | 10,858 (30.9%) | ||||
| Night | 10,349 (27.6%) | 406 (17.2%) | 9,943 (28.3%) | ||||
| Dawn | 5,878 (15.7%) | 227 (9.6%) | 5,651 (16.1%) | ||||
| Unknown | 72 (0.2%) | 5 (0.2%) | 67 (0.2%) | ||||
| Use of alcohol | <0.001 a | ||||||
| Yes | 1,821 (4.9%) | 45 (1.9%) | 1,176 (5.1%) | ||||
| No | 33,394 (89.0%) | 2,169 (91.9%) | 31,225 (88.8%) | ||||
| Unknown | 2,296 (6.1%) | 147 (6.2%) | 2,149 (6.1%) | ||||
| Seat belt use | <0.001 a | ||||||
| Yes | 31,046 (82.8%) | 1,865 (79.0%) | 29,181 (83.0%) | ||||
| No | 6,465 (17.2%) | 496 (21.0%) | 5,969 (17.0%) | ||||
| Types of vehicle | <0.001 a | ||||||
| Vehicles with up to 10 seats | 35,565 (94.8%) | 2,174 (92.1%) | 33,391 (95.0%) | ||||
| Vehicles with 11–19 seats | 790 (2.1%) | 72 (3.0%) | 718 (2.0%) | ||||
| Vehicles with 20 or more seats | 1,156 (3.1%) | 115 (4.9%) | 1,041 (3.0%) | ||||
a P value is the test result of the independent two group proportion difference using Pearson’s chi-squared test.
b Data are shown as median and interquartile ranges. P value is the test result of the independent two group mean difference using Wilcoxon rank sum test.