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Table 1 Odds ratios (ORs, 95% confidence intervals (CIs)) of hypertension according to serum 25(OH)D concentrations and SHS as categorical using a logistics regression model, NHANES 2007–2014(N = 2826)

From: Joint effect of 25-hydroxyvitamin D and secondhand smoke exposure on hypertension in non-smoking women of childbearing age: NHANES 2007-2014

  n (%) Crude OR P-value Model 1 OR P-value Model 2 OR P-value
25(OH)D level
 <50 nmol/L 270(22.5) 1.36(1.07, 1.74)** 0.013 1.62(1.19, 2.20)** 0.002 1.43(1.01, 2.04)** 0.046
 50-75 nmol/L 176(17.9) 1.02(0.79, 1.33) 0.868 1.24(0.92, 1.66) 0.158 1.17(0.84, 1.63) 0.363
 ≥75 nmol/L 114(17.6) Ref. Ref. Ref.
SHS
 Yes 219(22.3) 1.26(1.04, 1.53)** 0.018 1.14(0.91, 1.43) 0.246 1.12(0.88, 1.44) 0.364
 No 341(18.5) Ref. Ref. Ref.
  1. Model 1: adjusted for age, race, education level, marital status, PIR
  2. Model 2: model 1 + BMI, alcohol use, physical activity, diabetes, kidney disease
  3. SHS: Secondhand smoke; **: significant at p <0.05
  4. n (%): numbers and prevalence rates of hypertension of each layer