Table 4.

Factors associated with mortality after suffocation injury.

Variables	Odds ratio	95% CI	P value
Gender
Female	1.0	-	-
Male	1.3	1.1–1.6	0.008
Age (years)
≥66	1.0	-	-
19 – 65	1.2	0.9–1.6	0.256
4 –18	2.2	1.4–3.4	0.001
0 – 3	0.9	0.5–1.8	0.912
Admission day
Weekend	1.0	-	-
Weekday	0.8	0.7–1.0	0.078
Body system indicators
Diseases of the circulatory system (No)	1.0	-	-
Yes	11.6	8.8–15.1	<0.001
Diseases of the nervous system and sense organs (No)	1.0	-	-
Yes	3.0	2. 5–3.8	<0.001
Diseases of the respiratory system (No)	1.0	-	-
Yes	1.9	1.6–2.4	<0.001
Diseases of the genitourinary system (No)	1.0	-	-
Yes	1.5	1.1–1.9	0.003
Factors influencing health status and contact with health services (No)	1.0	-	-
Yes	0.8	0.7–0.9	0.010
Diseases of the digestive system (No)	1.0	-	-
Yes	0.6	0.4–0.7	<0.001
Diseases of the musculoskeletal system (No)	1.0	-	-
Yes	0.4	0.3–0.6	<0.001
Mental disorders (No)	1.0	-	-
Yes	0.4	0.3–0.5	<0.001
Injury and poisoning (No)	1.0	-	-
Yes	1.1	0.6–2.0	0.739
Intentional self-harm
Unintentional self-harm	1.0	-	-
Intentional self-harm	2.1	1.5–2.7	<0.001
More than one injury diagnosis
More than one injury diagnosis	1.0	-	-
One or no injury diagnosis	1.5	1.1–2.0	0.011
Injury diagnosis reported on record
No injury diagnosis reported	1.0	-	-
Injury reported	1.5	0.8–2.7	0.180
Method of Injury
Injury by falling (No)	1.0	-	-
Yes	1.3	0.7–2.6	0.446
Injury by poisoning (No)	1.0	-	-
Yes	0.4	0.1–1.3	0.124
Injury by assault (No)	1.0	-	-
Yes	1.1	0.6–1.8	0.912
Primary expected payer
Self-payer	1.0	-	-
Medicare	0.4	0.3 – 0.6	<0.001
Medicaid	0.3	0.2–0.4	<0.001
Private including Health Maintenance Organization (HMO)	0.5	0.3 – 0.6	<0.001
No charge	0.4	0.2 – 1.0	0.063
Other	0.5	0.4 – 0.8	0.003

CI, confidence interval.