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Table 1 Age distribution of the study participants subjected to bone mass measurements in three cohorts of women measured in 1970-74, 1987-93 and 1998-99.

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

Age class (years) Cohort 1970-74 Cohort 1987-93 Cohort 1998-99
  n = 106 n = 175 n = 178
Age 50-59 24 49 53
Age 60-69 40 46 41
Age 70-79 28 47 41
Age 80-90 14 33 43