condition mean min max ZT0-3 162.770973 162.770973 162.770973 ZT4-7 355.9003955 355.9003955 355.9003955 ZT8-11 754.6324454999999 754.6324454999999 754.6324454999999 ZT12-15 748.014748 748.014748 748.014748 ZT16-19 729.7182155 729.7182155 729.7182155 ZT20-23 512.925566 512.925566 512.925566