Table 5.

Beta coefficients derived from multivariate linear regression models for selected significant determinants from univariate analysis among postmenopausal women (n = 440), the Singapore Chinese Health Study

	Model Aa		Model Bb
	Beta estimate	p value for difference	Beta estimate	p value for difference
Age at menarche, year (vs. <13)		0.45	–
13–14	− 0.14
> 14	− 0.08
Years from menarche to first birth (vs. nulliparous)		0.38	–
< 9.5	− 0.06
9.5–< 10.5	− 0.11
10.5–< 15.5	− 0.02
≥ 15.5	0.08
Years from menarche to menopause (vs. < 34.5)		0.005		0.0002
34.5–< 38.5	− 0.15		− 0.11
38.5–< 40.5	0.01		− 0.03
≥ 40.5	0.21		0.28
Sleep, h/day (vs. ≤ 5)		0.002		0.002
6	− 0.13		− 0.11
7	− 0.11		− 0.10
8	0.10		0.11
≥ 9	0.20		0.21
Estrone, ln pg/mL	− 0.08	0.009	− 0.08	0.009
SHBG, ln nmol/mL	0.09	0.005	0.08	0.009

R² for base model with covariates only (i.e., age at blood draw and time since last meal) is 0.007. R² is 0.125 for Model A and 0.109 for Model B

Two women were excluded from this analysis as Estrone measurements were not available for them

^aModel A includes terms for age at menarche, years from menarche to first birth, years from menarche to menopause, hours of sleep, plasma estrone, and SHGB as well as covariates for age at blood draw and time since last meal

^bModel B includes terms for years from menarche to menopause, hours of sleep, plasma estrone, and plasma SHGB