Table 2:  Segmental force at the level of the annulus and STJ from MD to MS for both groups
Force (N)  Single ring  Double ring   P-value between groups
Annulus LN segment  0.7 ± 1.4  0.6 ± 1.0  NS
Annulus RN segment  1.3 ± 1.0  1.3 ± 1.0  NS
Annulus LR segment  4.3 ± 1.5  4.2 ± 1.1  NS
STJ LN segment  0.2 ± 0.3  0.1 ± 0.3  NS
STJ RN segment  0.7 ± 0.6  0.0 ± 0.3  0.001
STJ LR segment  0.8 ± 0.7  0.0 ± 0.9  0.041
All data are presented as mean ± standard deviation.
LN: left/non-coronary segment; LR: left/right-coronary segment; MD: mid-diastole; MS: mid-systole; NS: non-significant; RN: right/non-coronary segment; STJ: Sinotubular junction.