Table 1.

The Physiologic Severity Score (PSS) used for data collection

	0 points	1 point	2 points	3 points	4 points
Respiratory rate	No breathing	<10	> 35	25–35	10–24
Systolic blood pressure	No pulse	< 50	50–69	70–90	> 90
Consciousness	No response	Only to pain	To sound	Confused	Normal

The rated value (0–4 points) for respiratory rate, systolic blood pressure, and consciousness were combined to create the PSS sum score (0–12 points)