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Table 2 Dietary calcium, vitamin D intake, and physical activity per day of the participants

From: Dietary carotenoid intake and fracture risk based on NHANES 2013–2018 data: a propensity score matching

Variable

Mean ± SD

Reference value

Calcium (mg/day/kcal)

 

0.89 ± 0.47

1.00 ~ 1.200

Vitamin D (mg/day/kcal)

 

4.00 (2.00, 7.25)

1.00 ~ 4.00

Physical activity (hour/day)

 

1.67 (0.77, 1.57)

1.2 ~ 1.95

  1. Abbreviations: SD Standard deviation, a Median (Q1, Q3)