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Table 3 Surgical procedures and medication error use and near-misses

From: The impact of hospital accreditation on quality measures: an interrupted time series analysis

Model validation and parameter estimation Diagnostic tests
Surgical Procedure Measures Intercept Time(β 1 ) Intervention (β 2 ) (Change in level) Tim_Aft_Int (β 3 ) (Change in slope) R2 Autocorrelation (AC) Check (Durbin Watson) Test for Seasonality/Stationarity (Dickey Fuller Unit Root Test)
Value P-value Value P-value Coefficient 95%Confidence Interval (LCI, UCI) P-value Coefficient 95%Confidence Interval (LCI, UCI) P-value D-Value (before) D-Value (after) P-value Result
Y 7 87.91 0.00* 1.21 0.00* −2.70(−4.76, −0.63) 0.01* −1.18(−1.72, −0.64) 0.01* 0.96 1.30 2.53 0.00 No Seasonality
Y 8 14.89 0.00* −0.28 0.38 −0.36(−4.66, 3.95) 0.87 0.32(−0.31, 0.95) 0.31 0.49 2.10 No AC 0.00 No Seasonality
Y 9 0.08 0.5 0.003 0.88 −0.05(−0.30, 0.20) 0.69 0.01(−0.03, 0.04) 0.63 0.34 1.86 No AC 0.00 No Seasonality
Reported medication error measure
Y 10 0.03 0.03* 0.002 0.21 −0.04(−0.06, −0.01) 0.00* −0.00(−0.01, 0.00) 0.18 0.35 1.56 No AC 0.00 No Seasonality
  1. AC refers to Autocorrelation, D-Value is the Durbin Watson statistic, *P ≤ 0.05 is considered significant.