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. 2005 May 19;5:11. doi: 10.1186/1471-2482-5-11

Table 2.

Chi Squared approximation for difference in volume of collection based on size on D1

Amount of fluid in ml Drain group Non drain group

<4 cm >4 cm < 4 cm >4 cm
Mean D1 2.30 ml 5.935 ml 2.452 ml 2.011
Total number of patients 37 14 34 17

P = 0.313 (ns)