Table 4.

Comparison of Regression Equations Between HbA_1c and Average Glucose for Subgroups

Comparison	Difference in Slope	Difference in Intercept	Pa
Age
2nd vs 1st tertile	−10.81 ± 5.23	78.17 ± 38.47	0.13
3rd vs 2nd tertile	−3.54 ± 8.10	31.39 ± 57.07	0.68
3rd vs 1st tertile	−13.57 ± 6.65	108.81 ± 48.1	0.06
Sex
Male vs female	−2.82 ± 6.43	22.37 ± 45.97	0.87
Race
White vs black	−1.27 ± 9.87	0.63 ± 71.08	0.85
White vs other	−8.51 ± 11.95	67.54 ± 90.02	0.74
Other vs black	−6.25 ± 10.67	27.45 ± 85.95	0.48
BMI
<30 vs ≥30 kg/m2	−12.50 ± 4.85	94.58 ± 35.59	0.53
eGFR
<20 vs ≥20 mL/min	1.47 ± 4.81	−0.89 ± 35.32	0.43

Note: Values expressed as means ± standard error.

Abbreviations: BMI, body mass index; eGFR, estimated glomerular filtration rate; HbA_1c, glycated hemoglobin.

^aChi-squared test with 2 df comparing the intercept and slope simultaneously.