Table 2.

Comparison of prognosis between groups

Variables, mean ± SD	Good	Poor	t /Z	P value
Age (yr)	51.58 ± 18.49	52.51 ± 18.24	-0.434	0.665
Sex (M/F)	69/76	32/27	0.742	0.389
Time in ICU (d)	3.32 ± 2.57	3.53 ± 3.81	-0.999	0.318
APACHE-II	12.36 ± 7.53	20.39 ± 10.77	-4.933	0.000
H-Ammonia, μmol/L	67.06 ± 48.24	81.69 ± 59.63	-1.776	0.076
M-Ammonia, μmol/L	47.70 ± 23.79	63.85 ± 46.35	-2.039	0.041
I-Ammonia, μmol/L	48.43 ± 30.97	65.17 ± 46.26	-2.516	0.012

Good means cure or transferred to the ward; Poor means unhealed or died. P < 0.05 was considered statistically significant. ICU: Intensive care unit; APACHE-II: Acute Physiologic Assessment and Chronic Health Evaluation II; H-Ammonia: High-level of ammonia; I-Ammonia: Initial-level of ammonia.