Table 3.

Comparison of BCR and SSEP abnormality rates between sphincter subgroup and non-sphincter subgroup

Group	BCR (%)	SSEP (%)
Sphincter subgroup	46/48 (95.8%)a,b	16/24 (66.7%)a
Non-sphincter subgroup	43/58 (74.1%)a	19/29 (65.5%)a
Control group	3/80 (3.75%)	2/40 (5%)

^a P < 0.05 compared with control group;

^b P < 0.05 compared with non-sphincter subgroup.