condition mean min max ZT0-3 70.299507 70.299507 70.299507 ZT4-7 64.033691 64.033691 64.033691 ZT8-11 74.4517835 74.4517835 74.4517835 ZT12-15 74.1669285 74.1669285 74.1669285 ZT16-19 70.58649199999999 70.58649199999999 70.58649199999999 ZT20-23 80.77373850000001 80.77373850000001 80.77373850000001