extremely significantP < 0.01
After multiple comparison, there were significant differences between Groups A and B ( P = 0.028) and Groups A and C ( P = 0.012), but there was no significant difference between Groups B and C ( P = 0.769); there were extremely significant differences between 0, 3, 6, 9, 12, 18, and 24 months in Group A, Group B, and Group C, respectively (all P < 0.01).