Table 1

Description of the cohort, stratified by gender
Total Men Women
Mean (SD) N Mean (SD) N Mean (SD) N p-valuea
Body mass index (kg/m2) at 36y 24.1 (3.7) 2646 24.8 (3.2) 1289 23.5 (3.9) 1357 <0.001
Body mass index (kg/m2) at 43y 25.4 (4.2) 2745 25.7 (3.5) 1336 25.2 (4.7) 1409 0.001
Body mass index (kg/m2) at 53y 27.4 (4.8) 2917 27.4 (4.0) 1438 27.4 (5.5) 1479 0.812
% N % N % N p-valuea
Knee osteoarthritis clinical observation at 53y
 Yes 10.2 302 7.5 109 12.8 193 <0.001
Disabling/life-threatening health conditions at 53y 11.9 353 11.6 169 12.2 184 0.604
 1 or more
Family history of arthritis
 Yes 39.3 1099 35.5 486 42.9 613 <0.001
History of knee injury
 Yes 22.8 673 27.5 399 18.2 274 <0.001
Education at 26y
 Degree or higher 9.9 277 14.8 203 5.2 74
 GCE ‘A’ level, Burnham B or A2 25.6 714 28.0 384 23.3 330
 GCE ‘O’ level or Burnham C 20.1 561 14.6 200 25.5 361
 Sub GCE or vocational course 7.5 208 5.9 82 8.9 126
 No qualifications 36.9 1031 36.7 504 37.2 527 <0.001
Income at 53 y
>£50,000 8.4 234 9.7 137 7.0 97
 £25,000-£49,999 26.1 732 27.7 391 24.5 341
<£24,999 65.5 1835 62.6 882 68.5 953 0.002

ap-values for gender comparison by means of t-test & chi square.

Martin et al.

Martin et al. BMC Musculoskeletal Disorders 2013 14:219   doi:10.1186/1471-2474-14-219

Open Data