From: Retrospective study of the incidence of unstable and shock patients presenting to the emergency room
 | Period | P value | |||
---|---|---|---|---|---|
 | I | II | |||
Nov 1999-Jul 2000 (N = 277) | Nov 2007-Jul 2008 (N = 140) | ||||
 | N | % | N | % | |
Artificial respiration | Â | Â | Â | Â | Â |
Yes | 75 | 27.1% | 47 | 33.6% | 0.104 |
No | 202 | 72.9% | 93 | 66.4% | |
 | 277 |  | 140 |  | |
Hemodialysis | Â | Â | Â | Â | Â |
Yes | 1 | 0.4% | 1 | 0.7% | 0.559 |
No | 276 | 99.6% | 139 | 99.3% | |
 | 277 |  | 140 |  |