Table 2.

Comparison of the mean amount of chest tube drainage between two groups

Amount of Chest tube drainage (ml)	Intervention Group (n = 55)	Control Group (n = 55)	P value1
After admission to the ICU	19.09±49.52 0[0-100]	28.18±62.92 0[0-100]	0.679
2 hours after surgery	86.36±109.05 50[0-100]	108.18±114.56 100[0-150]	0.177
4 hours after surgery	59.09±133.71 0[0-100]	70.90±121.97 0[0-100]	0.525
6 hours after surgery	85.45±137.99 50[0-100]	95.45±106.40 50[0-150]	0.326
12 hours after surgery	105.45±139.00 100[0-150]	110.90±122.73 100[0-150]	0.609
24 hours after surgery	95.45±95.39 100[0-150]	130.90±136.24 100[0-150]	0.206
P value2	<0.001	<0.001

Data presented as mean ± standard deviation(SD) and median [IQR]. 1-The significance level obtained from the Mann-Whitney test comparing the variable mean rank between two groups at each time 2- The significance level obtained from the Friedman test for comparing the variable mean rank over time in each of the two groups