Table 4. The effect of tranexamic acid plus phenylephrine versus phenylephrine alone on the amount of bleeding by duration of time after surgery using ANOVA test.

	Intervention (n = 30)		Control 2 (n = 30)
Amount of bleeding (ml)	Mean	SD	Mean	SD	P valuea
0–15 min	23.37	13.92	48.67	14.53	0.001
16–30 min	34.50	21.49	60.10	18.78	0.001
31–45 min	42.38	23.77	60.38	23.17	0.006
Total time	100.10	52.50	170.49	45.87	0.001

^aAnalysis of variance adjusted for polyposis and treatment-by-polyposis interaction (the interaction term was significant for no group).