The data is not at all surprising. The connection between faithfulness to the Teachings of the Church and vocations to the priesthood has been alluded to in other studies.
The operative principle here, of course, is biblical. Jesus says:
"A good tree cannot bring forth evil fruit, neither can an evil tree bring forth good fruit. Every tree that bringeth not forth good fruit, shall be cut down, and shall be cast into the fire. Wherefore by their fruits you shall know them." Mt 7:18-20The sound of a buzz saw can be beautiful sometimes.