Table 10. Multi-Variable Inverse Gaussian Regression Model for Chest Tube Duration.

* statistically significant (p≤0.05)

Exp(b): exponential function of parameter (b); CI: confidence interval; SES: socioeconomic status; 3x Poverty: three-times federal poverty level; BMI: body mass index; FEV1%: forced expiratory volume in one second as percent of predicted; COPD: chronic obstructive pulmonary disease; GERD: gastroesophageal reflux disease; CVA: cerebrovascular disease

Variables	Exp(b)	95% CI	p-value
Intercept	8.85	5.14-15.24	<0.001*
SES Below 3x Poverty	1.03	0.81-1.30	0.821
Male Gender	1.26	1.09-1.47	0.002*
BMI	0.98	0.97-1.00	0.006*
Preoperative FEV1%	1.00	0.99-1.00	0.067
Current Smoker	1.15	0.92-1.44	0.229
Former Smoker	1.03	0.86-1.23	0.784
Preoperative COPD	1.29	1.04-1.60	0.020*
Preoperative Pancreatitis	1.53	0.71-3.32	0.279
Preoperative GERD	1.34	1.10-1.62	0.003*
Preoperative Chronic Anemia	0.53	0.38-0.76	<0.001*
Preoperative CVA	1.29	0.85-1.96	0.227