Table 1. Analysis of sociodemographic variables, morbidities, habits, diagnosis groups, surgery sites, and types of anesthesia.

Variables		Death n	No death n	Total n	Risk ratio	Odds ratio
Total		17	156	173	-	-
Age	40 to 59 years	2	45	47	Ref	Ref
	60 to 69 years	8	58	66	2.8	3.1
	70 years or over	7	53	60	2.7	3.0
Sex	Female	8	46	54	2.0	2.1
	Male	9	110	119	Ref	Ref
Race	White	17	146	163	-	-
	Brown	0	4	4	-	-
	Black	0	4	4	-	-
	Information not provided	0	2	2	-	-
Marital status	Married	13	96	109	2.2	2.0
	Single	1	7	8	2.3	2.5
	Widowed	3	30	33	Ref	Ref
	Divorced	0	21	21	Ref	Ref
	Others	0	1	1	Ref	Ref
	Information not provided	0	1	1	-	-
Educational level	Did not complete primary education	8	48	56	2.6	3.0
	Primary education completed	2	22	24	1.5	1.6
	Illiterate	0	6	6	Ref	Ref
	Literate	2	29	31	Ref	Ref
	Did not complete secondary education	0	1	1	Ref	Ref
	Secondary education completed	1	15	16	Ref	Ref
	Higher education completed	0	1	1	Ref	Ref
	Information not provided	4	34	38	-	-
	Diabetic	14	111	125	1.5	1.6
	Not diabetic	3	38	41	Ref	Ref
	Information not provided	0	7	7	-	-
	Hypertensive	15	108	123	2.7	3.0
	Not hypertensive	2	43	45	Ref	Ref
	Information not provided	0	5	5	-	-
	Smoker and ex-smoker	6	73	79	1.7	1.8
	Non-smoker	2	45	47	Ref	Ref
	Information not provided	9	38	47	-	-
	Alcoholic, social drinker, and ex-drinker	2	41	43	0.6	0.6
	No drinking	6	74	80	Ref	Ref
	Information not provided	9	41	50	-	-
Diagnosis	Cardiac disease	1	0	1	11.4	-
	Lung disease	1	2	3	3.8	5.2
	Kidney disease	1	1	2	5.7	10.4
	Infection	1	3	4	2.8	3.5
	Vascular disease	8	28	36	Ref	Ref
	Diabetes	5	81	86	Ref	Ref
	Wound/ulcer	0	20	20	Ref	Ref
	Hansen’s disease	0	5	5	Ref	Ref
	Cancer	0	1	1	Ref	Ref
	Information not provided	0	15	15	-	-
Site	At level of forearm	1	1	2	16.8	32.7
	At level of thigh	11	37	48	7.7	9.7
	At level of leg and lower limbs	2	20	22	3.1	3.3
	At level of foot and tarsal	1	27	28	Ref	Ref
	Hallux	2	48	50	Ref	Ref
	Fingers and toes	0	17	17	Ref	Ref
	Amputation finger by finger	0	3	3	Ref	Ref
	At level of hand and wrist	0	2	2	Ref	Ref
	Amputation of penis	0	1	1	Ref	Ref
Anesthesia	General anesthesia (inhaled and venous)	4	18	22	2.1	2.4
	Spinal anesthesia	13	108	121	Ref	Ref
	Local anesthesia and sedation	0	10	10	Ref	Ref
	Spinal anesthesia and sedation	0	9	9	Ref	Ref
	Local anesthesia	0	5	5	Ref	Ref
	Peridural anesthesia	0	3	3	Ref	Ref
	General anesthesia (venous)	0	2	2	Ref	Ref
	Peridural anesthesia and sedation	0	1	1	Ref	Ref

n indicates the number of occurrences and Ref indicates that these variables were included in the reference group for calculation of the risk ratio and the odds ratio.