Impact of date stamping on patient safety measurement in patients undergoing CABG: Experience with the AHRQ Patient Safety Indicators

Table 1 Impact of the POA indicator on observed rates of adverse events.

Patient Safety Indicators	No. of Events		Risk Pool		1-PPV	Observed Rates per 1000 Discharges at Risk
	No POA	POA	No POA	POA		No POA	POA
Decubitus Ulcer	228	135	49,463	49,463	0.41	4.61†	2.73†
Failure to Rescue	403	324	3298	2,095	0.20	122.2†	154.7†
Infection due to Medical Care	374	349	72,954	72,954	0.07	5.13	4.78
Postop Hemorrhage or Hematoma	524	455	82,046	82,046	0.13	6.39†	5.55†
Postop Physiologic & Metabolic Derangement	191	153	35,003	35,003	0.20	5.46†	4.37†
Postop Embolism or DVT	512	343	82,040	82,040	0.33	6.24†	4.18†
Postop Sepsis	247	207	30,054	30,054	0.16	8.22¥	6.89¥
Accidental Puncture or Laceration	961	848	82,050	82,050	0.12	11.71†	10.34†

† P-value ≤ 0.05
¥ P-value = 0.06
DVT – deep venous thrombosis, POA – present-on-admission indicator; PPV – positive predictive value; obs – observed; postop – postoperative

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