Table 5.

Hospital-based mortality rate of patients with ICD-9 ARDS criteria

ICD-9 code	Ventilation	1992	1993	1994	1995
	(days)
518.5	< 4*	10/35	27/116	32/158	42/179
518.82	< 4*	9/30	28/68	19/74	24/78
518.5	> 4†	30/72	105/245	130/315	116/296
518.82	> 4†	29/68	67/139	69/165	79/167
Total expired		78	227	250	216
(all categories)
Mortality
Upper limit		49%	52%	47%	49%
Lower limit		38%	39%	36%	36%

Data is presented in fractional form as survivors over total patients within each category. ^*ICD-9 code 96.71; ^†ICD-9 code 96.72.