Table 3.

Mean bone mineral density according to vitamin D receptor gene polymorphism by quintile of BMI

	Age group (years)	All		TT		Tt + tt
		n	BMD (mean ± SD)	n	BMD (mean ± SD)	n	BMD (mean ± SD)
All subjects	All ages	524	0.56 ± 0.06	426	0.56 ± 0.06	98	0.55 ± 0.06
	23–29	53	0.55 ± 0.05	39	0.55 ± 0.06	14	0.55 ± 0.04
	30–39	280	0.56 ± 0.06	226	0.56 ± 0.06	54	0.55 ± 0.06*
	40–49	191	0.56 ± 0.06	161	0.56 ± 0.06	30	0.56 ± 0.05
BMI by quintile (kg/m2)
<23.0	All ages	237	0.54 ± 0.06	188	0.54 ± 0.06	49	0.54 ± 0.06
	23–29	29	0.53 ± 0.04	20	0.52 ± 0.04	9	0.54 ± 0.03
	30–39	139	0.54 ± 0.06	109	0.54 ± 0.06	30	0.54 ± 0.06
	40–49	69	0.55 ± 0.06	59	0.55 ± 0.06	10	0.55 ± 0.05
≥23.0	All ages	287	0.57 ± 0.06	238	0.58 ± 0.06	49	0.56 ± 0.05
	23–29	24	0.57 ± 0.06	19	0.57 ± 0.07	5	0.57 ± 0.05
	30–39	141	0.58 ± 0.05	117	0.58 ± 0.05	24	0.56 ± 0.06*
	40–49	122	0.57 ± 0.06	102	0.57 ± 0.06	20	0.57 ± 0.05

Values are mean ± SD

BMI body mass index, BMD bone mineral density, DPD deoxypyridinoline, BAP bone alkaline phosphatase

Data were analyzed by Student’s t test

* P < 0.05 compared with TT