Table 3.

Analysis of the threshold effect of WC on the prevalence of infertility.

	Adjusted OR (95%CI), p value
Infertility
Fitting by the standard linear model	1.02 (1.01, 1.03) 0.0025
Fitting by the two-piecewise linear model
Inflection point	116.6cm
Waist Circumference <	1.03 (1.01, 1.04) <0.01
Waist Circumference >	0.99 (0.97, 1.02) 0.54
p for Log-likelihood ratio	0.043

The results of the threshold effect of WC on the prevalence of infertility was adjusted for age, Ratio of family income to poverty, Minutes sedentary activity, Meals from fast food or pizza place, Diabetes, Hypertension, high cholesterol level, Total Cholesterol, Direct HDL-Cholesterol.