Study of the patency of different peritoneal drains used prophylactically in bariatric surgery

Table 2 Volume of liquid collected daily with each type of drain

Postoperative days	Group 1 Latex	Group 2 Watterman	Group 3 Blake	P
Day 1	146 ± 57.5	190 ± 178.6	150 ± 79	0.656
Day 2	89 ± 74.1	96.7 ± 68.8	168.2 ± 107.6	0.091
Day 3	29.4 ± 27.7	57.3 ± 53	107.5 ± 79.2	0.016
Day 4	25.3 ± 16.6	34.8 ± 39.3	106.2 ± 106.5	0.021
Day 5	28.3 ± 40.7	34.1 ± 30.4	123.5 ± 105.3	0.005
Day 6	26.8 ± 40.6	21.3 ± 17	88.5 ± 51.8	0.001
Day 7	26.9 ± 36	19.5 ± 18.6	89.7 ± 76	0.007

Results in milliliters and represented by mean ± SD. P value obtained by ANOVA.