Table 2.

Statistical comparison (Anova)

1 vs. 2	●●	6 vs. 7	ns	12 vs. 14	ns
1 vs. 3	●●●	8 vs. 9	●●●	14 vs. 15	●●●
2 vs. 3	ns	8 vs. 10	ns	16 vs. 17	●●●
4 vs. 5	●●●	10 vs. 11	●●●	16 vs. 18	●●●
4 vs. 6	●●●	12 vs. 13	●●●	18 vs. 19	●●●

ns = not significantly different; significantly different: ●● = P < 0. 01; ●●● = P < 0. 001.