Table 1
Rating of the four options
Initial ratings
Mean
SD
Number of first preferences*
*Two equal ratings are scored as 0.5.
No intervention
−3.03
2.08
2
One stage TCPC
−1.32
3.08
9
Bi-directional Glenn
1.84
2.44
22.5
Two stage TCPC
2.55
2.28
44.5