condition mean min max ZT0-3 859.9141666666667 787.097 1004.909 ZT4-7 772.0835 772.0835 772.0835 ZT8-11 788.466 788.466 788.466 ZT12-15 851.8875 837.7515 866.0235 ZT16-19 911.0055 911.0055 911.0055 ZT20-23 1022.395 1022.395 1022.395