Table 2.

Difference in Measuring 40 CER Variables in EHR vs EHR Plus Claims Data

Training Set (MA)
Year After Cohort Entry	1	2	3	4	5	6	7
	Mean Standardized Differencea (95% CI)
Top two deciles of predicted EHR data-continuity	0.10 (0.09–0.11)	0.10 (0.09–0.11)	0.10 (0.09–0.11)	0.10 (0.09–0.11)	0.09 (0.07–0.10)	0.07 (0.06–0.09)	0.06 (0.05–0.08)
The remaining population	0.36 (0.35–0.37)	0.41 (0.40–0.42)	0.41 (0.40–0.43)	0.42 (0.40–0.43)	0.40 (0.39–0.41)	0.38 (0.36–0.40)	0.35 (0.33–0.37)
Ratio of mean standardized differences (95% CI)	0.28 (0.26–0.31)	0.25 (0.23–0.27)	0.25 (0.22–0.27)	0.24 (0.21–0.28)	0.22 (0.18–0.25)	0.19 (0.15–0.23)	0.19 (0.14–0.24)
Validation Set (NC)
Year after cohort entry	1	2	3	4	5	6	7
	Mean Standardized Differencea (95% CI)
Top two deciles of predicted EHR data-continuity	0.22 (0.20–0.24)	0.25 (0.22–0.27)	0.23 (0.21–0.26)	0.23 (0.20–0.25)	0.22 (0.19–0.25)	0.11 (0.08–0.14)	0.10 (0.07–0.13)
The remaining population	0.50 (0.49–0.52)	0.56 (0.54–0.57)	0.56 (0.54–0.58)	0.57 (0.55–0.59)	0.57 (0.55–0.60)	0.52 (0.49–0.55)	0.53 (0.49–0.57)
Ratio of mean standardized differences (95% CI)	0.44 (0.40–0.48)	0.44 (0.40–0.49)	0.42 (0.37–0.47)	0.39 (0.34–0.45)	0.39 (0.33–0.45)	0.22 (0.16–0.28)	0.19 (0.12–0.25)

Abbreviations: CI, confidence interval; EHR, electronic health records; CER, comparative effectiveness research.