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Table 2 Demographic, general health, psychological and lifestyle characteristics at each selectionpoint

From: The Knee Clinical Assessment Study – CAS(K). A prospective study of knee pain and knee osteoarthritis in the general population: baseline recruitment and retention at 18 months

  Responded to Health Survey Reported knee pain in last 12 months Consented to further contact Responded to Regional Pains Survey Attended research clinic Responded to 18 m FUP Survey
N* 6108 3106 2226 1949 819 776
Marital status:       
   Married/co-habiting 3956 (66) 1985 (65) 1511 (69) 1331 (69) 599 (74) 573 (75)
   Divorced/separated 431 (7) 219 (7) 175 (8) 145 (8) 45 (6) 42 (5)
   Widowed 1263 (21) 705 (23) 418 (19) 363 (19) 137 (17) 123 (16)
   Single 358 (6) 153 (5) 93 (4) 84 (4) 27 (3) 27 (4)
Higher education:       
   Yes 704 (12) 327 (11) 278 (13) 244 (13) 117 (15) 112 (15)
   No 5231 (88) 2685 (89) 1892 (87) 1657 (87) 684 (85) 650 (85)
Employment status:       
   Employed 1515 (26) 668 (22) 544 (25) 460 (24) 167 (21) 160 (21)
   Retired 3361 (57) 1760 (59) 1195 (55) 1075 (57) 481 (61) 449 (60)
   Unable due to illness 454 (8) 299 (10) 224 (10) 182 (10) 76 (10) 76 (10)
   Unemployed 61 (1) 31 (1) 26 (1) 25 (1) 9 (1) 9 (1)
   Housewife 362 (6) 187 (6) 129 (6) 118 (6) 46 (6) 44 (6)
   Other 133 (2) 53 (2) 41 (2) 30 (2) 15 (2) 15 (2)
Occupational class:       
   Higher manag. 184 (3) 92 (3) 81 (4) 78 (4) 55 (7) 53 (7)
   Higher prof. 105 (2) 39 (1) 35 (2) 32 (2) 16 (2) 16 (2)
   Lower manag./prof. 652 (12) 303 (11) 267 (13) 240 (13) 122 (16) 115 (16)
   Intermediate 615 (11) 302 (11) 243 (12) 218 (12) 108 (14) 104 (14)
   Self-employed 319 (6) 174 (6) 144 (6) 124 (7) 52 (7) 49 (7)
   Lower supervise./tech. 387 (7) 213 (8) 151 (7) 140 (8) 63 (8) 61 (8)
   Semi-routine 1397 (25) 712 (25) 505 (25) 443 (25) 190 (25) 177 (24)
   Routine 1887 (34) 979 (35) 628 (31) 532 (29) 167 (22) 156 (21)
Baseline SF-12: Mean (sd†)       
   Physical (0–100) 41.0 (12.5) 37.0 (12.2) 37.6 (12.2) 37.7 (12.2) 37.6 (11.9) 37.6 (11.8)
   Mental (0–100) 49.1 (11.1) 47.9 (11.6) 48.5 (11.5) 48.8 (11.4) 50.6 (10.9) 50.8 (11.0)
Baseline HAD Anxiety:       
   None (0–7) 3647 (62) 1656 (55) 1209 (56) 1084 (57) 500 (62) 477 (63)
   Possible (8–11) 1485 (25) 842 (28) 603 (28) 526 (28) 217 (27) 203 (27)
   Probable (12–21) 791 (13) 508 (17) 343 (16) 284 (15) 85 (11) 81 (11)
Baseline HAD Depression:       
   None (0–7) 4637 (78) 2198 (73) 1627 (75) 1456 (77) 663 (83) 633 (83)
   Possible (8–11) 950 (16) 593 (20) 392 (18) 320 (17) 102 (13) 92 (12)
   Probable (12–21) 349 (6) 221 (7) 139 (6) 119 (6) 37 (4) 36 (5)
"Osteoarthritis is a serious condition"       
   Strongly disagree 44 (1) 19 (1) 12 (1) 12 (1) 4 (1) 4 (1)
   Disagree 67 (1) 33 (1) 25 (1) 22 (1) 8 (1) 8 (1)
   Neither 423 (7) 189 (6) 134 (6) 108 (6) 39 (5) 36 (5)
   Agree 3326 (56) 1656 (55) 1163 (53) 1032 (54) 447 (56) 421 (55)
   Strongly agree 2074 (35) 1129 (37) 847 (39) 740 (39) 305 (38) 292 (38)
"Doctors can do a lot to help people with joint pain"       
   Strongly disagree 50 (1) 30 (1) 25 (1) 20 (1) 9 (1) 9 (1)
   Disagree 408 (7) 251 (8) 197 (9) 172 (9) 74 (9) 71 (9)
   Neither 1331 (22) 659 (22) 483 (22) 431(22) 171 (21) 163 (21)
   Agree 3693 (62) 1851 (61) 1300 (59) 1142 (59) 482 (60) 456 (60)
   Strongly agree 510 (9) 261 (9) 191 (9) 160 (8) 73 (9) 67 (9)
  1. Figures represent numbers and percentages unless otherwise stated
  2. * – individual items may not add to totals due to missing data
  3. † – sd = standard deviation