condition mean min max ZT0-3 22.159 22.159 22.159 ZT4-7 16.8928 16.8928 16.8928 ZT8-11 19.13695 19.13695 19.13695 ZT12-15 32.2787 32.2787 32.2787 ZT16-19 22.9895 22.9895 22.9895 ZT20-23 24.898249999999997 24.898249999999997 24.898249999999997