Table 2.

Associations between parity and femoral neck BMD

Parity	Model 1	Model 2	Model 3
	β (95% CI) p value	β (95% CI) p value	β (95% CI) p value
1–2	Reference	Reference	Reference
3–5	0.010 (− 0.007, 0.027) 0.231	− 0.003 (− 0.017, 0.012) 0.738	− 0.003 (− 0.018 , 0.011) 0.670
≥ 6	0.022 (− 0.029, 0.074) 0.395	0.002 (− 0.043, 0.047) 0.928	0.000  (− 0.044, 0.044) 0.998

Model 1: no covariates were adjusted

Model 2: age and BMI were adjusted

Model 3: age, BMI, total calcium, serum phosphorus, age at menarche, years since menopause, family PIR, race, education level, smoking behavior, alcohol consumption, PA, HRT, ever treated for osteoporosis, drug use, diabetes, arthritis, emphysema, chronic bronchitis, liver disease, kidney disease, and thyroid disease were adjusted