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

Table 6 International patient safety goals

Model validation and parameter estimation												Diagnostic tests
International Patient Safety Goal Measures	Intercept		Time(β₁)		Intervention (β₂) (Change in Level)		Tim_Aft_Int (β₃) (Change in Slope)		R²	Autocorrelation (AC) Check (Durbin Watson)		Test for Seasonality/Stationarity (Dickey Fuller Unit Root Test)
International Patient Safety Goal Measures	Value	P-value	Value	P-value	Coefficient 95%Confidence Interval (LCI, UCI)	P-value	Coefficient 95%Confidence Interval (LCI, UCI)	P-value	R²	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

AC refers to Autocorrelation, D-Value is the Durbin Watson statistic, *P ≤ 0.05 is considered significant.

ISSN: 1472-6963