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Table 2 Cohort activity exposure (occupational /leisure) at 36, 43, and 53 years, stratified by gender

From: Body mass index, occupational activity, and leisure-time physical activity: an exploration of risk factors and modifiers for knee osteoarthritis in the 1946 British birth cohort

  36 years 43 years 53 years
  Men Women Men Women Men Women
  % (N) % (N) % (N) % (N) % (N) % (N)
Manual occupation 68.3 (586) 31.7 (272) 36.1 (457) 24.4 (284) 39.1 (564) 28.9 (430)
Non-manual occupation 57.7 (702) 42.3 (513) 63.9 (810) 75.6 (880) 60.9 (877) 71.1 (1058)
p-value a   <0.001   <0.001   <0.001
Lifting§ unlikely 58.9 (773) 76.9 (1001) 61.3 (793) 71.1 (975) 62.6 (858) 71.8 (965)
Lifting somewhat likely 21.3 (279) 14.1 (183) 21.8 (282) 18.6 (255) 21.2 (291) 16.1 (217)
Lifting highly likely 19.8 (260) 9.0 (117) 16.9 (218) 10.4 (142) 16.1 (221) 12.1 (163)
p-value a   <0.001   <0.001   <0.001
Kneeling§ unlikely 61.9 (812) 45.5 (592) 63.3 (819) 60.6 (831) 67.7 (927) 66.3 (891)
Kneeling somewhat likely 22.4 (294) 46.6 (606) 21.7 (280) 31.1 (427) 18.4 (252) 24.5 (330)
Kneeling highly likely 15.7 (206) 7.9 (103) 15.0 (194) 8.3 (114) 13.9 (191) 9.2 (124)
p-value a   <0.001   <0.001   <0.001
Walking§ unlikely 90.8 (1191) 98.2 (1278) 93.0 (1203) 98.2 (1347) 92.1 (1262) 98.1 (1319)
Walking likely 9.2 (9.22) 1.8 (23) 7.0 (90) 1.8 (25) 7.9 (108) 1.9 (26)
p-value a   <0.001   <0.001   <0.001
Climbing§ unlikely 90.0 (1181) 96.0 (1249) 90.9 (1175) 95.6 (1312) 91.1 (1248) 94.7 (1273)
Climbing somewhat likely 6.3 (82) 4.0 (52) 5.5 (71) 4.4 (60) 5.0 (69) 5.3 (72)
Climbing highly likely 3.7 (49) 0 (0) 3.6 (47) 0 (0) 3.9 (53) 0 (0)
p-value a   <0.001   <0.001   <0.001
Sitting§ unlikely 31.2 (409) 22.4 (291) 31.2 (403) 25.5 (350) 30.2 (414) 28.8 (287)
Sitting somewhat likely 26.8 (351) 51.9 (675) 28.0 (363) 36.0 (494) 24.2 (332) 27.0 (375)
Sitting highly likely 42.0 (552) 25.7 (335) 40.8 (527) 38.5 (528) 45.6 (624) 43.4 (583)
p-value a   <0.001   <0.001   0.096
Physical activity       
 Inactive 31.2 (405) 41.3 (565) 47.5 (642) 55.0 (784) 48.1 (699) 50.7 (762)
 Less active 26.5 (344) 24.5 (335) 23.5 (318) 23.0 (328) 18.6 (270) 16.1 (242)
 Most active 42.4 (551) 34.3 (469) 29.0 (392) 12.0 (313) 33.3 (484) 33.2 (499)
p-value a   <0.001   <0.001   0.163
  1. a p- values for gender comparison by means of chi square or Fisher’s exact test.
  2. § Lifting: Regular lifting of weights ≥ 25 kg by hand; Kneeling: Bending, kneeling or squatting; Sitting: Sitting >2 hours per day; Climbing: Climbing ladders or >30 flights of stairs; Walking: Walking >2 miles per day.