Table 1.

Study population and survey rate

	No. of admission (1)	Died, discharged or transferred within the 72 hours(2)	Chart not available (3)	final study population (4)	survey rate (4)/(1)x100 (%)
95. 1. 1 ~ 12. 31	160	3	89	68	42.5
96. 1. 1 ~ 12. 31	150	6	36	108	72.0
97. 1. 1 ~ 12. 31	142	12	18	112	78.9
98. 1. 1 ~ 12. 31	119	5	15	99	83.2
99. 1. 1 ~ 9. 30	125	9	14	102	81.6
Total	696	35	172	489	70.3