highly significantp <0.001
These comparisons showed a highly significant difference between level −4 and 0, t (11) = 7.75, p <0.001, and between level +4 and 0, t (11) = 8.57, p <0.001.
These comparisons showed a highly significant difference between level −4 and 0, t (11) = 7.75, p <0.001, and between level +4 and 0, t (11) = 8.57, p <0.001.