Healthcare costs and outcomes associated with surgical site infections after coronary artery bypass grafting surgeries in Oman

Figures & data

Figure 1. Cases and controls finding methods.

Table 1. Sample characteristics (N = 508).

Variables	Cases	Controls	χ^2	p
	(N = 104)	(N = 404)
	N (%)	N (%)
Mean age (SD)	62.3 (8.6)	63.8 (9.2)	t = 1.5	.130
Sex
Male	62 (59.6)	327 (80.9)	21	<.010
Female	42 (40.4)	77 (19.1)
Body mass index^a
Obese	39 (38.2)	100 (25.4)	18	<.010
Overweight	45 (44.1)	137 (34.8)
Normal weight	17 (16.7)	147 (37.3)
Under weight	1 (1)	10 (2.5)
Type of surgery
Elective	91 (87.5)	381 (94.3)	6	.030
Emergency	13 (12.5)	23 (5.7)
Discharge status
Discharge home	98 (94.2)	379 (93.8)	0.52	.770
Died in hospital	6 (5.8)	23 (5.7)
Transfer to other hospital	0 (0)	2 (0.5)
Infection site for cases
Sternal wound	64 (61.5)	–
Leg wound	34 (32.7)	–
Sternal and leg wounds	6 (5.8)	–
Wound classification
Superficial wound infection	62 (59.6)	–
Deep wound infection	42 (40.4)	–
Wound management^b
Dressing	79 (77.5)	–
Wound debridement under general anaesthesia	9 (8.8)
Vacuum assisted device	14 (13.7)

^aMissing data in the control group: 10 cases for body mass index. Missing data in the case group: two cases each for body mass index.

^bMissing data in the case group: two cases for the wound management.

Table 2. Comparison of different health-related outcomes for case and control groups.

Variables	Cases	Controls	t (df)	p
	N = 104	N = 404
	M (SD)	M (SD)
Length of stay	24.4 (44.6)	11 (21.0)	4.4 (501)	.003
Healthcare costs^a	3823 (2516)	3154 (1415)	2.6 (506)	.010
	n (%)	n (%)	χ^2 (df)	p
Readmission rate	44 (42.3)	8 (2)	146.4 (1)	<.001
Fatality rate	6 (5.8)	23 (5.7)	0.001 (1)	1.000

^aHealthcare cost in Omani Rial OMR (1 OMR = 2.60 USD).

Data availability statement

The datasets analysed during the current study are available from the first author [Fatma AlRiyami] on reasonable request.