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Table 6 International patient safety goals

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

Model validation and parameter estimation Diagnostic tests
International Patient Safety Goal 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 22 40.56 0.000* 5.20 0.00* 0.79(−4.37, 5.94) 0.76 −5.269-6.19, −4.34) 0.00* 0.94 1.05 2.07 0.00 No Seasonality
Y 23 25.70 0.000* 7.51 0.00* −14.89(−21.30, −8.49) 0.00* −7.36(−8.64, −6.08) 0.00* 0.90 1.1 2.43 0.14 Seasonality
Y 24 91.94 0.000* 0.65 0.00* 0.21(−2.46, 2.89) 0.87 −0.67(−1.07, −0.28) 0.00* 0.42 1.96 No AC 0.00 No Seasonality
Y 25 −0.02 0.96 0.02 0.71 0.14(−0.43, 0.71) 0.62 −0.02(−0.11, 0.06) 0.62 0.03 1.72 No AC 0.00 No Seasonality
Y 26 98.48 0.00* −0.10 0.1 1.71(1.04, 2.38) 0.00* 0.11(0.00, 0.230) 0.06 0.52 2.86 2.03 0.06 Data Not Stationary
Y 27 55.51 0.00* 55.51 0.00* −1.67(−6.29, 2.96) 0.47 −4.26(−5.30, −3.22) 0.00* 0.90 0.89 2.6 0.26 No Seasonality
  1. AC refers to Autocorrelation, D-Value is the Durbin Watson statistic, *P ≤ 0.05 is considered significant.