Table 3.

Showing relative risk of burst abdomen with continuous suturing as reference and interrupted suturing as exposure category

Burst abdomen	Method of suturing		Total
	Interrupted suture	Continuous suture
Yes	10	19	29
No	217	102	319
Total	227	121	348
Risk of burst	0.044	0.157	0.083

2-sided Fisher’s exact P = 0.0008

Relative risk of burst, Point estimate = 0.28, 95 % C.I.: 0.13 to 0.58

Prevented fraction for burst, Point estimate = 71.9 %, 95 % C.I.: 41.59 % to 86.52 %