Table 1.

α₂ at timescales from 3 to 24 h in region II

Condition	0.5 y, m ± SE	1 y, m ± SE	1.5 y, m ± SE	2 y, m ± SE
With wheels	1.07 ± 0.007	1.00 ± 0.03	0.84 ± 0.04	0.82 ± 0.08
Without wheels	0.63 ± 0.03	0.66 ± 0.03	0.68 ± 0.02	0.63 ± 0.05
P value*	0.001	0.001	0.003	0.02

The presence of a wheel was followed by the absence of a wheel, and the last 9 d with a wheel are compared with the first 9 d without a wheel. m, mean; SE, standard error.

^*Paired t test.