From: Occupational kneeling and radiographic tibiofemoral and patellofemoral osteoarthritis
 | Floor layers | Graphic designers | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
 | Study sample | Survey respondents | Knee injury | Eligible sample* | Study participants | Study sample | Survey respondents | Knee injury | Eligible sample* | Study participants |
Age group | N | n (%)†| n (%)‡ | n (%) | n (%)§ | N | n (%)†| n (%)‡ | n (%) | n (%)§ |
≤ 49 years | 115 | 99 (86) | 11 (11) | 88 (77) | 43 (49) | 40 | 33 (83) | 4 (12) | 29 (73) | 7 (24) |
50–59 years | 111 | 99 (89) | 4 (4) | 95 (86) | 72 (76) | 155 | 128 (83) | 13 (10) | 115 (74) | 73 (64) |
≥ 60 years | 60 | 55 (92) | 7 (13) | 48 (80) | 19 (40) | 175 | 129 (74) | 15 (12) | 114 (65) | 40 (35) |
Total | 286 | 253 (89) | 22 (9) | 231 (81) | 134 (58) | 370 | 290 (78) | 32 (11) | 258 (70) | 120 (47) |