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Table 2 Characteristics of the study participants subjected to bone mass measurements in three cohorts of women measured in 1970-74, 1987-93 and 1998-99.a

From: Prevalence of osteoporosis and incidence of hip fracture in women - secular trends over 30 years

Characteristic Cohort 1970-74 Cohort 1987-93 Cohort 1998-99 P- valuec
  n = 106 n = 175 n = 178  
Age (yr) 67 (9.5) 68 (10.8) 65 (12.2) 0.01
Height (cm) 163 (6.0) 162 (5.8) 162 (6.9) 0.97
Weight (kg) 67 (11.0) 66 (12.2) 69 (12.5) 0.08
Body-mass indexb 25 (3.9) 25 (4.4) 26 (4.7) 0.08
  1. a Values are means(SD).
  2. b The body-mass index is the weight in kilograms divided by the square of the height in metres.
  3. c Comparing all three cohorts by analysis of variance.