highly significantp < 0.001
A highly significant linear trend could be demonstrated, F (1, 56) = 336.72, p < 0.001, partial η 2 = 0.857 which was completed by a quadratic trend, F (1, 56) = 11.18, p = 0.001, partial η 2 = 0.166 and one of the 6th order, F (1, 56) = 19.137, p < 0.001, partial η 2 = 0.255.