condition mean min max ZT0-3 1.183115 1.183115 1.183115 ZT4-7 1.329965 1.329965 1.329965 ZT8-11 1.35065 1.35065 1.35065 ZT12-15 0.76658 0.76658 0.76658 ZT16-19 1.2550284999999999 1.2550284999999999 1.2550284999999999 ZT20-23 1.276705 1.276705 1.276705