Table 3.

Multivariable regressions of hospitalization costs per inpatient day and LOS by MCCs category among ACSCs in the AHRQ PQIs

	Overall composite (PQI 90)		Acute composite (PQI 91)		Chronic composite (PQI 92)
Costs per inpatient daya	Relative costs	95 % CI	Relative costs	95 % CI	Relative costs	95 % CI
Intercept (dollars per day)	$1937		$1896		2057
0–1 chronic condition	1.00	Ref.	1.00	Ref.	1.00	Ref.
2–3 chronic conditions	1.03	(1.03–1.03)	1.01	(1.00–1.01)	1.01	(1.01–1.02)
4–5 chronic conditions	1.05	(1.04–1.05)	1.01	(1.01–1.02)	1.02	(1.01–1.02)
6+ chronic conditions	1.04	(1.03–1.04)	1.01	(1.01–1.02)	0.99	(0.99–1.00)
Length of stay-Model 1a	Relative stay	95 % CI	Relative stay	95 % CI	Relative stay	95 % CI
Intercept (Days)	3.88		3.86		3.86
0–1 chronic condition	1.00	Ref.	1.00	Ref.	1.00	Ref.
2–3 chronic conditions	1.13	(1.13–1.14)	1.11	(1.11–1.12)	1.17	(1.16–1.18)
4–5 chronic conditions	1.22	(1.22–1.23)	1.21	(1.20–1.22)	1.24	(1.23–1.25)
6+ chronic conditions	1.23	(1.22–1.23)	1.27	(1.26–1.28)	1.22	(1.21–1.23)
Length of stay-Model 2b	Relative stay	95 % CI	Relative stay	95 % CI	Relative stay	95 % CI
Intercept (Days)	2.80		2.96		2.77
0–1 chronic condition	1.00	Ref.	1.00	Ref.	1.00	Ref.
2–3 chronic conditions	1.15	(1.15–1.16)	1.12	(1.11–1.13)	1.18	(1.17–1.20)
4–5 chronic conditions	1.24	(1.23–1.25)	1.20	(1.19–1.21)	1.24	(1.22–1.25)
6+ chronic conditions	1.22	(1.21–1.23)	1.25	(1.24–1.26)	1.18	(1.16–1.19)

Abbreviations: ACSC ambulatory care sensitive condition, CI confidence interval, LOS length of stay

^a Model adjusted for age, sex, race

^b Model adjusted for age, sex, race and discharge status

Source: Agency for Healthcare Research and Quality, Healthcare Cost and Utilization Project, State Inpatient Databases, 2012