Calcium Intake and the 10-year Incidence of Self-Reported Vertebral Fractures in Women and Men: The Japan Public Health Centre-based Prospective Study

Br J Nutr. 2009 Jan;101(2):285-94. doi: 10.1017/S0007114508993533. Epub 2008 Jun 13.

Abstract

The purpose of this study was to evaluate the effect of low Ca intake on the 10-year incidence of vertebral fractures in cohorts I and II of the Japan Public Health Centre-based Prospective Study. The baseline studies were conducted in 1990-1994, with the follow-up studies conducted after 10 years. We analysed 33,970 subjects aged 40-59 years in cohort I and 41,664 subjects aged 40-69 years in cohort II. At baseline, the intake of Ca was assessed as a predictor, using validated FFQ. A meta-analysis was performed to estimate a summary relative risk (RR) for the two cohort studies. The 10-year cumulative incidences of self-reported vertebral fractures were 0.38% for cohort I and 0.56% for cohort II. In women, lower Ca intake was associated with a higher incidence of vertebral fractures (P for trend=0.001), with the lowest quartile of Ca intake having a significantly higher incidence (0.89/1000 persons per year or RR 2.10 (95% CI 1.25, 3.55)) than that (0.42/1000 persons per year) of the highest. In addition, the RR calculated using energy-adjusted Ca intake (by the residual method) as an outcome was 1.92 (95% CI 1.28, 2.88). However, no such association was observed in men. An increase of Ca intake should be considered as a preventive strategy for vertebral fractures in peri- and post-menopausal women with a low Ca intake.

Publication types

  • Meta-Analysis
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Calcium, Dietary / administration & dosage*
  • Female
  • Follow-Up Studies
  • Health Surveys
  • Humans
  • Incidence
  • Japan / epidemiology
  • Logistic Models
  • Male
  • Middle Aged
  • Postmenopause
  • Prospective Studies
  • Risk
  • Spinal Fractures / epidemiology*
  • Surveys and Questionnaires

Substances

  • Calcium, Dietary