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Table 3—

Comparison of regression equations between A1C and AG for subgroups

ComparisonDifference in slopeDifference in interceptP*
Sex Male vs. female 0.17 ± 1.14 0.57 ± 7.94 0.91 
Diabetes type Type 1 vs. type 2 −1.46 ± 1.61 9.35 ± 11.21 0.41 
Age, type 1 diabetes 1st vs. 2nd tertile −1.03 ± 2.27 −5.61 ± 16.56 0.71 
 1st vs. 3rd tertile 1.53 ± 2.37 −6.99 ± 17.59 0.18 
 2nd vs. 3rd tertile 0.50 ± 2.47 −1.38 ± 18.29 0.69 
Age, type 2 diabetes 1st vs. 2nd tertile −7.40 ± 3.67 52.00 ± 24.43 0.08 
 1st vs. 3rd tertile −1.57 ± 3.36 11.59 ± 22.31 0.84 
 2nd vs. 3rd tertile 5.83 ± 3.07 −40.41 ± 21.45 0.17 
Ethnicity Caucasian vs. African/African-American 3.87 ± 1.85 23.35 ± 12.48 0.07 
 Caucasian vs. Hispanic −1.80 ± 3.12 5.89 ± 20.51 0.81 
 Hispanic vs. African/African-American −2.06 ± 3.49 17.46 ± 22.94 0.43 
Smoking Never vs. current 2.62 ± 1.48 −16.76 ± 10.93 0.14 
ComparisonDifference in slopeDifference in interceptP*
Sex Male vs. female 0.17 ± 1.14 0.57 ± 7.94 0.91 
Diabetes type Type 1 vs. type 2 −1.46 ± 1.61 9.35 ± 11.21 0.41 
Age, type 1 diabetes 1st vs. 2nd tertile −1.03 ± 2.27 −5.61 ± 16.56 0.71 
 1st vs. 3rd tertile 1.53 ± 2.37 −6.99 ± 17.59 0.18 
 2nd vs. 3rd tertile 0.50 ± 2.47 −1.38 ± 18.29 0.69 
Age, type 2 diabetes 1st vs. 2nd tertile −7.40 ± 3.67 52.00 ± 24.43 0.08 
 1st vs. 3rd tertile −1.57 ± 3.36 11.59 ± 22.31 0.84 
 2nd vs. 3rd tertile 5.83 ± 3.07 −40.41 ± 21.45 0.17 
Ethnicity Caucasian vs. African/African-American 3.87 ± 1.85 23.35 ± 12.48 0.07 
 Caucasian vs. Hispanic −1.80 ± 3.12 5.89 ± 20.51 0.81 
 Hispanic vs. African/African-American −2.06 ± 3.49 17.46 ± 22.94 0.43 
Smoking Never vs. current 2.62 ± 1.48 −16.76 ± 10.93 0.14 

Data are means ± SE.

*

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

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