. 2023 Aug 21;23:583. doi: 10.1186/s12903-023-03268-5

Table 4.

Counts and percentages of different modes of failure retainers in the study groups

Failure mode test	Group			Test of significance p value
Failure mode test	Group A	Group B	Group C
Cohesive in the tooth	0 (0.00%)	0 (0.00%)	0 (0.00%)	NA
Adhesive at the tooth interface	0 (0.00%)	0 (0.00%)	0 (0.00%)	NA
Cohesive in resin	0 (0.00%)	0 (0.00%)	0 (0.00%)	NA
Adhesive at the retainer interface	12 (100.00%)^a	0 (0.00%)^b	9 (75.00%)^a	c²_(df=2) = 26.743 p < .001*
Cohesive in retainer	0 (0.00%)^a	12 (100.00%)^b	3 (25.00%)^a	c²_(df=2) = 26.743 p < .001*

n : Number of sample.

NA : non-applicable (due to exact match).