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Table 1 Age, sex, persistent pain and risk factors at different study phases

From: Association of osteoarthritis risk factors with knee and hip pain in a population-based sample of 29–59 year olds in Denmark: a cross-sectional analysis

  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)
  1. Figures represent numbers and percentages unless otherwise stated
  2. BMI body mass index
  3. aKnee/hip problems = defined as the participants who reported to have had persistent knee and/or hip pain or discomfort during the last month, or that they had had a knee/hip injury or surgery
  4. bNormal/underweight (BMI ≤ 25), overweight (25 > BMI ≤ 30), obesity (BMI > 30)