Association between serum estradiol level and appendicular lean mass index in middle-aged postmenopausal women

Table 2 Association between serum estradiol level (pg/mL) and appendicular lean mass index (kg/m²)

	Model 1 β (95%CI)	Model 2 β (95%CI)	Model 3 β (95%CI)
Serum estradiol level	0.004 (0.002, 0.007)a	0.003 (0.001, 0.005)a	0.001 (0.000, 0.002)b
Serum estradiol level categories
Q1	Reference	Reference	Reference
Q2	0.665 (0.406, 0.924)	0.607 (0.356, 0.859)	0.090 (-0.036, 0.216)
Q3	1.222 (0.969, 1.475)	1.199 (0.953, 1.445)	0.128 (-0.002, 0.258)
Q4	1.369 (1.126, 1.612)	1.385 (1.133, 1.637)	0.268 (0.133, 0.402)
P value	< 0.001	< 0.001	< 0.001

^aP < 0.001.

^bP < 0.01.

Model 1: No covariates were adjusted. Model 2: Age and race were adjusted. Model 3: Age, race, educational level, body mass index, ratio of family income to poverty, moderate activities, total protein, blood urea nitrogen, serum uric acid, and serum calcium were adjusted.