From: The impact of hospital accreditation on quality measures: an interrupted time series analysis
Model validation and parameter estimation | Diagnostic tests | ||||||||||||
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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 |