Table 4. The odds ratio of osteopenia and osteoporosis of femur neck and lumbar spine according to daily calcium intake and serum vitamin D level.

	Femur neck		Lumbar spine
	OR (95% CI)	P-value	OR (95% CI)	P-value
Caa) ≥800 mg & 25(OH)D ≥20 ng/mL	Reference		Reference
Caa) ≥800 mg & 25(OH)D <20 ng/mL	1.820 (0.888–3.729)	0.102	2.993 (1.372–6.530)	0.006
400 mg≤ Caa) <800 mg & 25(OH)D ≥20 ng/mL	1.330 (0.706–2.508)	0.377	2.213 (1.090–4.492)	0.028
400 mg≤ Caa) <800 mg & 25(OH)D <20 ng/mL	2.167 (1.195–3.932)	0.011	2.721 (1.382–5.359)	0.004
Caa) <400 mg & 25(OH)D ≥20 ng/mL	1.201 (0.657–2.194)	0.552	1.980 (1.001–3.915)	0.050
Caa) <400 mg & 25(OH)D <20 ng/mL	2.242 (1.256–4.003)	0.006	3.044 (1.569–5.906)	0.001

Adjusted values; age, body mass index, physical activity, smoking history, history of estrogen therapy, history of fracture.

OR, odds ratio; CI, confidence interval; Ca, calcium; 25(OH)D, 25-hydroxyvitamin D.

^a)Daily calcium intake.