Association between dietary selenium intake and the prevalence of osteoporosis: a cross-sectional study

Table 2 Association between dietary selenium intake and the prevalence of OP (n = 6267)

	Quartiles of dietary selenium intake (μg/day)				P for trend
	Q1 (≤ 29.2)	Q2 (29.3–39.8)	Q3 (39.9–51.8)	Q4 (≥ 51.9)	P for trend
Median selenium intake (μg/day)	22.8	34.8	45.0	63.4	–
Total
Model 1 (95% CI)	1.00 (Ref.)	0.78 (0.61, 0.99)	0.76 (0.56, 1.01)	0.51 (0.35, 0.75)	0.001
Model 2 (95% CI)	1.00 (Ref.)	0.72 (0.55, 0.94)	0.72 (0.51, 1.01)	0.47 (0.31, 0.73)	0.001
Model 3 (95% CI)	1.00 (Ref.)	0.72 (0.55, 0.95)	0.73 (0.51, 1.03)	0.48 (0.31, 0.75)	0.002
Male
Model 1 (95% CI)	1.00 (Ref.)	0.33 (0.16, 0.66)	0.38 (0.19, 0.77)	0.20 (0.08, 0.46)	0.001
Model 2 (95% CI)	1.00 (Ref.)	0.33 (0.16, 0.68)	0.41 (0.20, 0.83)	0.22 (0.09, 0.52)	0.003
Model 3 (95% CI)	1.00 (Ref.)	0.35 (0.17, 0.71)	0.42 (0.20, 0.89)	0.25 (0.10, 0.61)	0.010
Female
Model 1 (95% CI)	1.00 (Ref.)	0.77 (0.59, 1.00)	0.74 (0.52, 1.05)	0.53 (0.34, 0.84)	0.008
Model 2 (95% CI)	1.00 (Ref.)	0.83 (0.62, 1.11)	0.80 (0.54, 1.19)	0.54 (0.33, 0.90)	0.018
Model 3 (95% CI)	1.00 (Ref.)	0.82 (0.60, 1.10)	0.79 (0.53, 1.19)	0.53 (0.32, 0.89)	0.018

Ref. reference group, OR odds ratio, CI confidence interval
Model 1 included dietary energy intake (quartiles)
Model 2 included age (40–49, 50–59, 60–69, ≥ 70 years), gender (male, female), BMI (< 28, ≥ 28 kg/m²), and energy intake (quartiles) (age, BMI and energy intake for the gender subgroup)
Model 3 added smoking status (yes/no), drinking status (yes/no), activity level (continuous data), nutritional supplements (yes/no), diabetes (yes/no), hypertension (yes/no), dietary fibre intake (quartiles), and dietary calcium intake (quartiles) on the basis of model 2

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