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KOA grades in relation to ages and genders of the participant.
| Group | Grade I n (%) | Grade IIA n (%) | Grade IIB n (%) | Grade III n (%) | P-value |
|---|---|---|---|---|---|
| <40 years | 37 (84%) | 20 (60.6%) | 9 (21.9%) | 4 (9%) | <0.0001**** df=63.28, 3 |
| ≥ 40 years | 7 (16%) | 13 (39.4%) | 32 (78.1%) | 41 (91%) | |
| Total | 44 (100%) | 33 (100%) | 41 (100%) | 45 (100%) | |
| Males | 35 (79.5%) | 24 (67.7%) | 19 (46.3%) | 24 (53.3%) | 0.0044** df=13.12, 3 |
| Females | 9 (20.5) | 9 (27.3%) | 22 (53.7%) | 21 (46.7%) | |
| Total | 44 (100%) | 33 (100%) | 41 (100%) | 45 (100%) |
