Table 1.

Average Patient Length of Stay, Patient Turnover, Turnover Indices, Severity, and Severity Index in Pennsylvania Hospitals 1994–2001

	1994	1995	1996	1997	1998	1999	2000	2001	%Δ1994–2001
Average patient length of stay
Mean	6.32	5.96	5.67	5.50	5.26	5.13	4.90	4.87	—
Standard deviation	1.67	2.23	2.21	1.95	2.00	2.03	1.04	0.97	—
%Δ from prior year	—	−4.46	−5.04	−2.41	−4.16	−2.47	−1.88	−1.73	−20.84
Patient turnover
Mean	0.17	0.18	0.19	0.19	0.20	0.20	0.21	0.22	—
Standard deviation	0.03	0.03	0.04	0.04	0.04	0.04	0.04	0.04	—
%Δ from prior year	—	6.97	6.05	2.98	4.73	1.45	2.65	2.42	29.43
Turnover index 1*
Mean	1.00	1.07	1.14	1.18	1.23	1.24	1.28	1.29	—
Standard deviation	0	0.10	0.13	0.17	0.16	0.17	0.16	0.19	—
%Δ from prior year	—	6.97	6.27	2.98	4.70	1.34	3.24	1.20	29.43
Turnover index 2†
Mean	1.00	1.04	1.07	1.08	1.11	1.11	1.13	1.13	—
Standard deviation	0	0.04	0.05	0.07	0.06	0.07	0.07	0.08	—
%Δ from prior year	—	3.56	2.96	1.37	2.33	0.69	1.40	0.23	13.26
Patient severity score
Mean	1.12	1.15	1.11	1.17	1.39	1.40	1.32	1.23	—
Standard deviation	0.22	0.25	0.25	0.27	0.21	0.23	0.22	0.19	—
%Δ from prior year	—	2.82	−1.86	8.75	23.56	1.04	−5.49	−6.11	9.8
Severity index
Mean	1.00	1.03	1.00	1.07	1.31	1.31	1.25	1.16	—
Standard deviation	0	0.13	0.16	0.32	0.56	0.57	0.51	0.49	—
%Δ from prior year	—	2.78	−1.77	8.61	23.70	0.99	−5.56	−6.16	15.66

^*Turnover index 1 uses 1/LOS.

^†Turnover index 2 uses square root (1/LOS).