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Table 2 Associations of serum calcium, 25(OH)D with total bone mineral density

From: Associations between serum calcium, 25(OH)D level and bone mineral density in adolescents

  Model 1
β (95% CI)
Model 2
β (95% CI)
Model 3
β (95% CI)
Serum calcium −0.0157 (−0.0257, −0.0058) −0.0003 (− 0.0083, 0.0077) 0.0084 (0.0007, 0.0160)
Serum calcium (quartile)
 Q1 Reference Reference Reference
 Q2 −0.0065 (− 0.0163, 0.0033) 0.0072 (− 0.0003, 0.0148) 0.0088 (0.0017, 0.0160)
 Q3 0.0008 (−0.0087, 0.0103) 0.0136 (0.0062, 0.0211) 0.0141 (0.0070, 0.0212)
 Q4 −0.0144 (− 0.0233, − 0.0055) 0.0032 (− 0.0040, 0.0103) 0.0098 (0.0030, 0.0166)
P for trend 0.004 0.484 0.008
Serum 25(OH)D −0.0005 (− 0.0009, − 0.0002) 0.0001 (− 0.0003, 0.0003) 0.0006 (0.0003, 0.0008)
Serum 25(OH)D (quartile)
 Q1 Reference Reference Reference
 Q2 −0.0415 (− 0.0532, − 0.0298) −0.0051 (− 0.0145, 0.0044) 0.0050 (− 0.0040, 0.0139)
 Q3 −0.0475 (− 0.0581, − 0.0369) 0.0046 (− 0.0046, 0.0138) 0.0166 (0.0079, 0.0254)
 Q4 −0.0384 (− 0.0483, − 0.0284) 0.0030 (− 0.0062, 0.0122) 0.0202 (0.0113, 0.0291)
P for trend < 0.001 0.181 < 0.001
  1. Model 1: no covariates were adjusted
  2. Model 2: age, gender, race/ethnicity were adjusted
  3. Model 3: age, gender, race/ethnicity, body mass index, income to poverty ratio, physical activity, and calcium supplementation use were adjusted