A Comparison of a Fully Covered and an Uncovered Segmented Biodegradable Esophageal Stent in a Porcine Model: Preclinical Evaluation of Degradation, Complications, and Tissue Reactions

Table 2

TRS for groups A and B from week 1 to week 12.

	TRS score		value
	Group A	Group B
W1	2.50 ± 0.55	1.67 ± 0.52	0.022
W2	3.33 ± 0.52	2.50 ± 0.54	0.022
W3	3.67 ± 0.52	2.52 ± 0.50	0.04
W4	2.50 ± 0.55	2.33 ± 0.52	0.599
W5	1.83 ± 0.41	2.33 ± 0.52	0.092
W6	1.50 ± 0.55	2.17 ± 0.75	0.110
W7	1.56 ± 0.75	1.83 ± 0.75	0.664
W8	1.00 ± 0.00	1.33 ± 0.52	0.145
W9	1.00 ± 0.00	1.66 ± 0.52	0.01
W10	0.00 ± 0.00	1.00 ± 0.61	0.003
W11	0.00 ± 0.00	0.83 ± 0.41	0.001
W12	0.00 ± 0.00	0.00 ± 0.00	/

TRS scores were expressed as mean ± SD. Compared with group A, degrees of tissue reactions in group B were milder at weeks 1–3, with no significance at weeks 4–8, and more severe at weeks 9–11.