Table 4. Drain management related factors associated with post-CABG pleural effusion.

Variable	Pleural effusion drainage group (n=59)	No pleural effusion drainage group (n=350)	P value
Hours from operation to drain removed	32.2±16.4	37.2±22.5	0.04*
Day of drain removal			0.0495
Day 0 or 1	32 (54.2%)	142 (40.6%)
Day 2+	27 (45.8%)	208 (59.4%)
Drain output >140 mL (midnight to 06:00 day of removal)	10 (16.9%)	28 (8.0%)	0.03*
Drain removed prior to extubation	6 (10.2%)	10 (2.9%)	<0.01*
Drain removed within 4 hours post-extubation	17 (28.8%)	15 (4.3%)	<0.01*
Drains removed within day of extubation	40 (67.8%)	160 (45.7%)	<0.01*

*, statistically significant P value <0.05. CABG, coronary artery bypass grafting.