condition mean min max ZT0-3 2.78953 2.78953 2.78953 ZT4-7 2.45938 2.45938 2.45938 ZT8-11 1.925355 1.925355 1.925355 ZT12-15 1.85102 1.85102 1.85102 ZT16-19 2.95986 2.95986 2.95986 ZT20-23 3.023 3.023 3.023