Table 1 Age, sex, persistent pain and risk factors at different study phases
Source population | Invited to consent | Consented to participate in TOF pilot study | Invited to respond to TOF survey | TOF survey respondents | TOF survey respondents with knee/hip problems a | Invited to respond to second questionnaire | Second questionnaire respondents | |
|---|---|---|---|---|---|---|---|---|
N | 9400 | 8814 | 3587 | 3557 | 2661 | 1152 | 1126 | 867 |
Age (years) | ||||||||
29–39 | 2633 (28) | 2488 (28) | 669 (19) | 665 (19) | 430 (16) | 165 (14) | 159 (14) | 116 (13) |
40–49 | 3179 (34) | 2989 (34) | 1147 (32) | 1136 (32) | 811 (30) | 326 (28) | 322 (29) | 236 (27) |
50–59 | 3588 (38) | 3337 (38) | 1771 (49) | 1756 (49) | 1420 (53) | 661 (57) | 645 (57) | 515 (59) |
Sex | ||||||||
Women | 4644 (49) | 4379 (50) | 1982 (55) | 1964 (55) | 1497 (56) | 638 (55) | 629 (56) | 476 (55) |
Men | 4756 (51) | 4435 (50) | 1605 (45) | 1593 (45) | 1164 (44) | 514 (45) | 497 (44) | 391 (45) |
Persistent knee/hip pain | 729 (27) | 729 (63) | 714 (63) | 561 (65) | ||||
BMIb | ||||||||
Normal/underweight | 1102 (41) | 420 (36) | 409 (36) | 310 (36) | ||||
Overweight | 1001 (38) | 444 (39) | 433 (38) | 335 (39) | ||||
Obesity | 558 (21) | 288 (25) | 284 (25) | 222 (26) | ||||
Leisure time physical activity | ||||||||
High intensity activities | 66 (2) | 26 (2) | 23 (2) | 14 (2) | ||||
Moderate intensity activities | 763 (29) | 332 (29) | 324 (29) | 253 (29) | ||||
Low intensity activities | 1448 (54) | 626 (54) | 615 (55) | 484 (56) | ||||
Sedentary | 384 (14) | 168 (15) | 164 (15) | 116 (13) | ||||
Previous knee/hip injury | 737 (28) | 737 (64) | 718 (64) | 559 (64) | ||||
Previous knee/hip surgery | 395 (15) | 395 (34) | 388 (34) | 305 (35) | ||||
Family history of osteoarthritis | ||||||||
No | 999 (38) | 304 (26) | 296 (26) | 222 (26) | ||||
I don’t know | 494 (19) | 217 (19) | 215 (19) | 168 (19) | ||||
Yes | 1168 (44) | 631 (55) | 615 (55) | 477 (55) | ||||