Table 1 Results of multiple linear regression of the natural logarithm of relative risks/odds ratios of seven studies⁵⁷,⁶⁴,⁶⁶,⁶⁸,⁶⁹,⁷⁰,⁷¹ on body mass index (BMI) group, female sex, and the interaction of BMI group and female sex.

Variable	Coefficient	Standard error	T	p Value
Intercept	−0.26
BMI group	0.19	0.028	6.67	5.47×10−8
Female sex	0.38	0.14	2.61	0.0097
BMI group×female sex	−0.129	0.04	3.38	0.002

r² =  0.57; F = 0.57; regression degrees of freedom = 3; residual degrees of freedom = 40; p = 2.08×10⁻⁷.

The regression equation for men is:

ln(relative risk/odds ratio)  =  −0.26 + 0.19 × BMI group.

The regression equation for women is:

ln(relative risk/odds ratio)  =  0.12 + 0.06 × BMI group.