| n | Plain radiograph (x-ray) | MRI | CT | Ultrasound |
---|---|---|---|---|---|
Total | 21,975 | 19,183 (87.3%) | 2236 (10.2%) | 5511 (25.1%) | 1427 (6.5%) |
Sex | |||||
 Male | 7881 | 6888 (87.4%) | 819 (10.4%) | 2158 (27.4%) | 478 (6.1%) |
 Female | 14,088 | 12,291 (87.2%) | 1416 (10.0%) | 3350 (23.8%) | 948 (6.7%) |
z statistic (Mann-Whitney U), p, ra |  | z = − 3.1, p < .002, r = 0.02 | z = − 1.5, p < .134, r = 0.03 | z = −6.7, p < .001, r = 0.09 | z = − 1.3, p < .182, r = 0.03 |
Age | |||||
 18–24 | 5411 | 4989 (92.2%) | 243 (4.5%) | 1020 (18.9%) | 159 (2.9%) |
 25–34 | 4824 | 4207 (87.2%) | 455 (9.4%) | 1132 (23.5%) | 288 (6.0%) |
 35–44 | 4206 | 3542 (84.2%) | 571 (13.6%) | 1153 (27.4%) | 308 (7.3%) |
 45–54 | 3576 | 3046 (85.2%) | 550 (15.4%) | 1015 (28.4%) | 306 (8.6%) |
 55–64 | 2233 | 1891 (84.7%) | 282 (12.6%) | 662 (29.6%) | 216 (9.7%) |
  > 65 | 1725 | 1508 (87.4%) | 135 (7.8%) | 529 (30.7%) | 150 (8.7%) |
Chi-squared (χ2) (Kruskal-Wallis H), p, ε2a |  | χ2 = 112.5, p < .001, ε2 = 0.01 | χ2 = 363.0, p < .001, ε2 = 0.16 | χ2 = 200.8, p < .001, ε2 = 0.04 | χ2 = 199.7, p < .001, ε2 = 0.14 |
Area of residence | |||||
 Major cities | 16,147 | 13,938 (86.3%) | 1844 (11.4%) | 3925 (24.3%) | 1138 (7.0%) |
 Inner regional | 4850 | 4381 (90.3%) | 313 (6.5%) | 1304 (26.9%) | 232 (4.8%) |
 Outer regional | 804 | 717 (89.2%) | 52 (6.5%) | 233 (29.0%) | 45 (5.6%) |
 Remote | 14 | 11 (78.6%) | 3 (21.4%) | 3 (21.4%) | – |
 Very remote | 1 | 1 (100%) | – | – | – |
Chi-squared (χ2) (Kruskal-Wallis H), p, ε2a |  | χ2 = 268.9, p < .001, ε2 = 0.01 | χ2 = 61.7, p < .001, ε2 = 0.03 | χ2 = 87.1, p < .001, ε2 = 0.02 | χ2 = 13.8, p < .007, ε2 = 0.01 |
Common law lodged | |||||
 Yes | 872 | 569 (65.3%) | 447 (51.3%) | 400 (45.9%) | 196 (24.5%) |
 No | 21,103 | 18,614 (88.2%) | 1789 (8.5%) | 5111 (24.2%) | 1231 (5.8%) |
z statistic (Mann-Whitney U), p, ra |  | z = −6.7, p < .001, r = 0.04 | z = −41.7, p < .001, r = 0.88 | z = −14.8, p < .001, r = 0.20 | z = −20.3, p < .001, r = 0.53 |