condition mean min max ZT0-3 73.21978333333334 11.83 106.03745 ZT4-7 41.11325 41.11325 41.11325 ZT8-11 81.74605 81.74605 81.74605 ZT12-15 68.316775 61.18285 75.4507 ZT16-19 106.678 106.678 106.678 ZT20-23 146.01049999999998 146.01049999999998 146.01049999999998