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Table 1 Age, gender and practice at each selection point.

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

  All eligible participants 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 8984 6108 3106 2226 1949 819 776
Practice:        
   A 3449 (38) 2268 (37) 1227 (40) 804 (36) 690 (36) 302 (37) 284 (37)
   B 3696 (41) 2535 (42) 1251 (40) 913 (41) 806 (41) 330 (40) 314 (40)
   C 1839 (20) 1305 (21) 628 (20) 509 (23) 453 (23) 187 (23) 178 (23)
Age (years):        
   50–59 3014 (34) 1866 (31) 898 (29) 730 (33) 614 (32) 236 (29) 231 (30)
   60–69 2535 (28) 1872 (31) 964 (31) 734 (33) 663 (34) 312 (38) 303 (39)
   70–79 2056 (23) 1555 (25) 822 (26) 551 (25) 490 (25) 222 (27) 201 (26)
   80+ 1369 (15) 815 (13) 422 (14) 211 (9) 182 (9) 49 (6) 41 (5)
Gender        
   Female 4887 (54) 3416 (56) 1832 (59) 1259 (57) 1108 (57) 440 (54) 417 (54)
   Male 4097 (46) 2692 (44) 1274 (41) 967 (43) 841 (43) 379 (46) 359 (46)
  1. Figures represent numbers and percentages unless otherwise stated