The reproducibility of 24-h dietary recall for estimating mineral intakes and their food sources among middle-aged Japanese men and women

Abstract

The objective of the present study was to examine reproducibility for mineral intakes estimated by single 24-h dietary recall for middle-aged Japanese men and women. We conducted repeated cross-sectional study between 1973 and 1999. The subjects were 262 Japanese people (132 men and 130 women) aged 40–69 years. The median Spearman correlation coefficients (range) for mineral intakes were 0.43 (0.31–0.55) for men and 0.39 (0.32–0.50) for women. The correlation coefficients stratified by the survey periods 1973–1984 and 1985–1999 were 0.42 (0.31–0.53) for men and 0.44 (0.34–0.53) for women during the earlier period, and 0.43 (0.22–0.62) for men and 0.29 (0.21–0.65) for women during the later period. In conclusion, the reproducibility of single 24-h dietary recall was fairly good for estimating mineral intakes by middle-aged Japanese men and women, although the reproducibility for some minerals tended to decline from the mid-1980s.