Table 4 Correlation between disc morphology and joint position in different age groups
Age group | Position | Biconcave | Contracture | Lengthened | Irregular | χ2, P | r, P |
|---|---|---|---|---|---|---|---|
≤ 18Y, (n = 390) | NA | 76 (72.4%) | 1 (0.7%) | 15 (26.8%) | 1 (1.2%) | 333.056, 0.000 | 0.558, 0.000 |
s-ADD | 10 (9.5%) | 0 (0.0%) | 7 (12.5%) | 0 (0.0%) | |||
m-ADD | 18 (17.1%) | 144 (99.3%) | 18 (32.1%) | 80 (95.2%) | |||
PDD | 1 (1.0%) | 0 (0.0%) | 16 (28.6%) | 3 (3.6%) | – | ||
19-30Y, (n = 950) | NA | 184 (57.5%) | 1 (0.4%) | 60 (42.0%) | 1 (0.5%) | 647.641, 0.000 | 0.517, 0.000 |
s-ADD | 67 (20.9%) | 8 (2.8%) | 20 (14.0%) | 0 (0.0%) | |||
m-ADD | 65 (20.3%) | 275 (96.5%) | 41 (28.7%) | 201 (99.5%) | |||
PDD | 4 (1.3%) | 1 (0.4%) | 22 (15.4%) | 0 (0.0%) | – | ||
> 30Y (n = 420) | NA | 91 (59.5%) | 7 (7.1%) | 23 (41.8%) | 6 (5.3%) | 241.669, 0.000 | 0.555, 0.000 |
s-ADD | 34 (22.2%) | 1 (1.0%) | 6 (10.9%) | 0 (0.0%) | |||
m-ADD | 27 (17.6%) | 90 (91.8%) | 21 (38.2%) | 107 (93.9%) | |||
PDD | 1 (0.7%) | 0 (0.0%) | 5 (9.1%) | 1 (0.9%) | – | ||
Total (n = 1760) | NA | 351 (60.7%) | 9 (1.7%) | 98 (38.6%) | 8 (2.0%) | 1204.523, 0.000 | 0.535, 0.000 |
s-ADD | 111 (19.2%) | 9 (1.7%) | 33 (13.0%) | 0 (0.0%) | |||
m-ADD | 110 (19.0%) | 509 (96.4%) | 80 (31.5%) | 388 (97.0%) | |||
PDD | 6 (1.0%) | 1 (0.2%) | 43 (16.9%) | 4 (1.0%) | – |