Parameter  Single ring  Double ring   P-value between groups
Max  Min  Change %  Max  Min  Change %  Max  Min  Change %
Annulus area (mm2)  320.9 ± 40.5  286.2 ± 33.5  12.1 ± 3.8  321.3 ± 38.8  282.8 ± 34.7  13.7 ± 5.5  NS  NS  NS
Annulus circumference (mm)  70.8 ± 3.8  67.2 ± 3.5  5.4 ± 1.1  71.6 ± 3.9  67.6 ± 3.5  6.0 ± 2.0  NS  NS  NS
STJ area (mm2)  234.8 ± 37.6  201.8 ± 36.5  16.9 ± 6.4  147.5 ± 31.8  136.6 ± 30.7  8.2 ± 3.1  <0.001  <0.001  0.001
STJ circumference (mm)  60.4 ± 4.9  56.5 ± 5.2  7.0 ± 3.1  49.3 ± 5.5  47.5 ± 5.5  4.1 ± 1.8  <0.001  <0.001  0.02
Annulus left/non-segment (mm)  22.1 ± 2.2  20.6 ± 1.9  6.9 ± 2.8  22.1 ± 2.5  20.5 ± 1.9  7.7 ± 3.2  NS  NS  NS
Annulus right/non-segment (mm)  20.1 ± 2.3  18.7 ± 1.9  7.6 ± 1.6  21.2 ± 3.7  19.6 ± 3.4  8.2 ± 3.6  NS  NS  NS
Annulus left/right segment (mm)  28.9 ± 3.9  27.4 ± 3.7  5.5 ± 2.0  28.6 ± 4.0  26.9 ± 4.0  6.5 ± 2.4  NS  NS  NS
STJ left/non-segment (mm)  19.4 ± 2.4  18.3 ± 2.3  6.4 ± 3.6  17.1 ± 2.3  16.4 ± 2.3  4.7 ± 1.4  NS  NS  NS
STJ right/non-segment (mm)  19.6 ± 2.9  18.1 ± 3.0  8.2 ± 3.4  15.1 ± 3.5  14.4 ± 3.4  4.8 ± 1.8  0.005  0.02  0.01
STJ left/right segment (mm)  21.4 ± 2.0  19.9 ± 1.8  7.4 ± 3.9  17.1 ± 2.2  16.3 ± 2.0  4.9 ± 3.0  <0.001  <0.001  NS
Annulus crystal NC–LR (crystal 1–4)  25.8 ± 1.5  23.3 ± 1.4  10.4 ± 3.2  25.6 ± 1.6  23.1 ± 1.4  11.0 ± 3.5  NS  NS  NS
Annulus crystal RC–LN (crystal 2–5)  18.8 ± 2.9  16.4 ± 2.4  14.6 ± 3.6  19.3 ± 3.0  16.8 ± 2.6  14.8 ± 4.0  NS  NS  NS
Annulus crystal LC–RN (crystal 3–6)  22.7 ± 2.2  21.5 ± 2.3  5.8 ± 2.8  22.0 ± 1.9  20.3 ± 1.7  8.0 ± 3.1  NS  NS  NS
STJ crystal NC–LR (crystal 7–10)  20.3 ± 1.8  18.7 ± 1.6  8.6 ± 3.5  15.8 ± 1.7  15.2 ± 1.7  4.1 ± 1.9  <0.001  <0.001  0.001
STJ crystal RC–LN (crystal 8–11)  17.8 ± 1.3  16.4 ± 1.2  8.8 ± 3.6  13.5 ± 2.3  12.9 ± 2.3  5.1 ± 2.5  <0.001  <0.001  0.009
STJ crystal LC–RN (crystal 9–12)  18.7 ± 2.1  17.6 ± 2.1  6.6 ± 3.9  15.4 ± 1.6  14.6 ± 1.8  5.7 ± 2.4  <0.001  0.001  NS