condition mean min max ZT0-3 4.046525 3.65625 4.4368 ZT4-7 5.29579 5.29579 5.29579 ZT8-11 11.559550000000002 11.559550000000002 11.559550000000002 ZT12-15 0 0 0 ZT16-19 13.022649999999999 13.022649999999999 13.022649999999999 ZT20-23 7.34812 7.34812 7.34812