condition mean min max ZT0-3 8.4851975 7.176475 9.79392 ZT4-7 6.533665 6.533665 6.533665 ZT8-11 7.32718 7.32718 7.32718 ZT12-15 0 0 0 ZT16-19 7.772724999999999 7.772724999999999 7.772724999999999 ZT20-23 7.436615 7.436615 7.436615