Table 3. Statistically significant associations.

Risk factor	Complication	P value	Odds ratio	95% confidence interval
Smoking (active)	Seroma	<0.0001	36	5.9-193.9
	Infection	0.0081	4.3	1.3-14.1
	Pneumonia	<0.0001	17.1	3.3-89.9
Unilateral reconstruction	Fat necrosis	0.0083	4	1.4-11.4

Additionally, BMI was found to be a statistically significant risk factor for infection (P<0.00001). As BMI is a continuous variable with a range of values, odds ratios could not be calculated, however, a positive coefficient of 0.1617 indicates that as BMI increases, the chance of infection increases.