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Table 2 Basic characteristics of the cohort of 315,495 Norwegian men and women

From: Risk factors for knee replacement due to primary osteoarthritis, a population based, prospective cohort study of 315,495 individuals

  Men Women
No. of participants 153,795 161,700
No. of knee replacements for primary OA 430 893
BMI at screeening* 25.4 (3.2) 24.3 (4.0)
Age at screening years* 43.1 (7.2) 43.0 (7.3)
Age at start follow up years* 46.8 (7.6) 46.7 (7.6)
Age at operation* 62.8 (8.7) 64.4 (9.0)
Age at end follow up years* 58.7 (6.9) 58.9 (7.3)
  1. *Mean (SD).