Table 4.

Association Between EHR and Follow-up HbA_1c and LDL-C Values

Baseline Test Value*	EHR Status	Average Change (95% CI)
HbA1c
<7%	EHR vs. no EHR	−0.045% (−0.054% to −0.036%)
7%–8.9%	EHR vs. no EHR	−0.079% (−0.092% to −0.065%)
≥9%	EHR vs. no EHR	−0.143% (−0.180% to −0.106%)
LDL-C
<2.6 mmol/L (<100 mg/dL)	EHR vs. no EHR	−0.019 mmol/L (−0.025 to −0.012 mmol/L)
		[−0.721 mg/dL (−0.986 to −0.456 mg/dL)]
2.6–3.3 mmol/L (100–129 mg/dL)	EHR vs. no EHR	−0.037 mmol/L (−0.046 to −0.028 mmol/L)
		[−1.435 mg/dL (−1.770 to −1.100 mg/dL)]
≥3.4 mmol/L (≥130 mg/dL)	EHR vs. no EHR	−0.057 mmol/L (−0.071 to −0.042 mmol/L)
		[−2.189 mg/dL (−2.741 to −1.637 mg/dL)]

EHR = electronic health record; HbA_1c = hemoglobin A_1c; LDL-C = low-density lipoprotein cholesterol.

^*Baseline test value was defined as the last measure in 2003 (before the study period).These analyses excluded patients with no baseline measurement. “EHR” is defined after the second post-EHR test for each patient because the post-EHR treatment patterns would probably not be experienced by the patient until after his or her first post-EHR measurement is available. The models are separate multivariate linear regressions based on baseline HbA_1c or LDL-C value with a fixed effect at the patient level (using the Stata xtreg command with the fe option), adjusted for calendar quarter and calendar year.