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Table 1 Study demographics

From: Self-reported adult footwear and the risks of lower limb osteoarthritis: the GOAL case control study

  GOAL interview footwear questions Responders: Additional footwear questionnaire Non-responders: Additional footwear questionnaire
Control Knee OA Hip OA Control Knee OA Hip OA Control Knee OA Hip OA
N= 1122 1007 1042 597 471 483 525 536 559
%Female 49% 48% 50% 47% 48% 49% 47% 49% 53%
Age 63 (9) 68 (7)** 68 (7)** 64 (8) 67 (7)** 67 (7)** 65 (9) 69 (7)** 68 (7)**
BMI 27 (5) 31 (5)** 29 (5)** 28 (5) 31 (6)** 29 (5)** 27 (5) 31 (5)** 29 (5)**
BMI in 20’s 22.5 (5.5) 24 (4)** 23 (4)** 23 (6) 24 (3)** 23 (4)** 22 (3) 24 (4)** 24 (4)**
Knee injury 17% 32%** 17% 18% 34%** 19% 16% 30%** 14%
Hip injury 2% 3% 7%** 2% 3% 10%** 2% 3% 5%*
  1. The demographics of the responders to the footwear questions from the additional GOAL questionnaire are shown. They were similar to the demographics of the main GOAL study (published elsewhere[19]). Mean (s.d.) or percentage prevalence of characteristics within study groups. **-p < 0.01, *-p < 0.05 vs controls. Statistical significance is highlighted in bold.