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Table 4 Difference between outcomes in hospitals that adopted EMR (n = 425) vs. non-EMR (n = 283) hospitals, before and after the years of EMR adoption by DRG type (surgical or medical) and hospital characteristics (for all DRGs)

From: The effect of electronic medical record adoption on outcomes in US hospitals

DRGs   Number of hospitals 30-day rehosp 30-day mortality Inpatient mortality Length of stay
    Difference in outcome (Std. Err) Difference in outcome (Std. Err) Difference in outcome (Std. Err) Difference in outcome (Std. Err)
Surgical DRGs    −0.05%   0.23% *   −0.24% **   −0.11 day  
    (0.09)   (0.08)   (0.06)   (0.13)  
Medical DRGs    0.37% **   −0.22% **   −0.01%   0.07 day**  
    (0.06)   (0.07)   (0.05)   (0.023)  
Hospital characteristics     P-value   P-value   P-value   P-value
Number of Bed 1st Quartile (Less than 170)   0.24 % ** 0.71 0.06 % 0.17 0.08% * 0.16 0.04 day 0.42
   185 (0.08)   (0.08)   (0.03)   (0.07)  
  2nd Quartile (170–260)   0.32% **   −0.11 %   −0.03 %   −0.07 day  
   188 (0.06)   (0.00)   (0.05)   (0.05)  
  3rd Quartile (261–390)   0.26 % **   −0.14 **   −0.02%   −0.19 day  
   177 (0.06)   (0.04)   (0.04)   (0.13)  
  4th Quartile (Over 390)   0.33 % **   0.02   0.07%   - 0.07 day  
   158 (0.06)   (0.08)   (0.04)   (0.11)  
Teaching Status Teaching   0.29 % ** 0.99 −0.05 % 0.65 −0.004 % 0.55 - 0.01 day 0.20
   399 (0.05)   (0.05)   (0.06)   (0.08)  
  Non-Teaching   0.29 % **   −0.02 %   0.03%   −0.16 day *  
   309 (0.07)   (0.06)   (0.04)   (0.09)  
Ownership For-profit   0.27 % ** 0.02 −0.02 % 0.02 0.01% 0.95 −0.05 day 0.28
   551 (0.06)   (0.04)   (0.03)   (0.05)  
  Not-for-profit   0.07 %   −0.20 %   0.04 %   0.08 day  
    (0.08)   (0.16)   (0.11)   (0.14)  
  Public 55 0.42 % **   −0.09 %   0.03 %   −0.39 day  
   102 (0.11)   (0.09)   (0.06)   (0.33)  
  1. Difference in outcomes was calculated by subtracting the mean values in the eight quarters before the year of EMR adoption with the values in the eight quarters after the year of EMR adoption.
  2. All outcomes were adjusted by patient (gender, age and race) and disease characteristics (DRG weight and Comorbidities).
  3. ** p < 0.01, * p < 0.05.