Table 7.

Contribution of factors toward measuring the schooling gradient in total diabetes prevalence

Other variables*	Coefficients on schooling
	NHANES IV		NHANES III		NHANES II
	Ed med	Ed high	Ed med	Ed high	Ed med	Ed high
(1) None	−0.058 (4.06)	−0.078 (6.04)	−0.045 (5.06)	−0.071 (2.81)	−0.019 (1.24)	−0.066 (4.08)
(2) = (1) + Race and ethnicity	−0.021 (1.55)	−0.041 (3.31)
(3) = (2) + Smoking + exercise	−0.049 (1.38)	−0.036 (2.79)
(4) = (3) + Parental diabetes	−0.025 (1.96)	−0.041 (3.43)
(5) = (4) + Excessive weight	−0.020 (1.65)	−0.033 (2.89)	−0.012 (1.68)	−0.023 (2.95)	0.015 (1.02)	−0.014 (0.91)
(6) = (5) + Income groups	−0.015 (1.23)	−0.019 (1.62)

Estimated DF/dx for schooling coefficients with z statistics based on robust standard errors in parentheses.

^*Other variables included in model in addition to schooling.