condition mean min max ZT0-3 20.7081712425 17.52182533 23.894517155 ZT4-7 38.7836146625 34.39277922 43.174450105 ZT8-11 31.4824693675 27.846208845 35.11872989 ZT12-15 23.1156255625 21.17903356 25.052217565 ZT16-19 41.977459727500005 33.05788897 50.897030485 ZT20-23 89.20759205750001 74.463892595 103.95129152000001