Objective To learn the association between dietary calcium intake and sleep quality among middle-aged and elderly square dancers in China. Method The data of the study were from the cohort study on lifestyle and healthy aging of Chinese square dancers. Dietary information was collected by semi-quantitative food frequency questionnaire (SFFQ), and dietary calcium intake was calculated according to the Chinese Food. Composition Tables (6th edition). The Pittsburgh sleep quality index was used to estimate the sleep status during the past month. The PSQI score >5 were defined as poor sleep quality. The t-test and Chi square test were used to compare the differences in basic information among subjects with different sleep qualities. Logistic regression analysis was used to calculate the odds ratio (OR) and 95% confidence interval (CI) to explore the association between dietary calcium intake and sleep quality. Results A total of 2427 middle-aged and elderly individuals were included, with an average age of (62.15±6.14) years. About 1656 (68.23%) had good sleep quality, while 771 (31.77%) had poor sleep quality. The average dietary calcium intake of the former was 643.49 mg/d, while that of the latter was 594.78 mg/d. The average dietary calcium intake of the subjects with good sleep quality was 8.19% higher than that of those with poor sleep quality. Multiple logistic regression analysis showed that compared with the group with the lowest dietary calcium intake (1st quintile), the group with the highest intake (5th quintile) had better sleep quality (OR=0.59, 95% CI: 0.45,0.79), after adjusting for confounding factors. Further analyses showed that compared to the group with the lowest dietary calcium intake (1st quintile), the highest group (5th quintile) had a stronger protective effect of dietary calcium intake on subjective sleep quality (OR=0.70, 95% CI: 0.52, 0.94), sleep latency (OR=0.63, 95% CI: 0.48, 0.82), sleep duration (OR=0.52, 95% CI. 0.40, 0.68), and sleep efficiency (OR=0.53, 95% CI: 0.41, 0.69). Conclusion There is a significant correlation between higher dietary calcium intake and better sleep quality among middle-aged and elderly people in China.
Key words
dietary calcium intake /
sleep quality /
middle-aged and elderly people
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