Table 3—

Comparison of regression equations between A1C and AG for subgroups

ComparisonDifference in slopeDifference in interceptP*
SexMale vs. female0.17 ± 1.140.57 ± 7.940.91
Diabetes typeType 1 vs. type 2−1.46 ± 1.619.35 ± 11.210.41
Age, type 1 diabetes1st vs. 2nd tertile−1.03 ± 2.27−5.61 ± 16.560.71
1st vs. 3rd tertile1.53 ± 2.37−6.99 ± 17.590.18
2nd vs. 3rd tertile0.50 ± 2.47−1.38 ± 18.290.69
Age, type 2 diabetes1st vs. 2nd tertile−7.40 ± 3.6752.00 ± 24.430.08
1st vs. 3rd tertile−1.57 ± 3.3611.59 ± 22.310.84
2nd vs. 3rd tertile5.83 ± 3.07−40.41 ± 21.450.17
EthnicityCaucasian vs. African/African-American3.87 ± 1.8523.35 ± 12.480.07
Caucasian vs. Hispanic−1.80 ± 3.125.89 ± 20.510.81
Hispanic vs. African/African-American−2.06 ± 3.4917.46 ± 22.940.43
SmokingNever vs. current2.62 ± 1.48−16.76 ± 10.930.14
  • Data are means ± SE.

  • * χ2 test with 2 d.f. comparing the intercept and slope simultaneously.