condition mean min max ZT0-3 25.725316666666664 12.0574 33.9235 ZT4-7 7.191685 7.191685 7.191685 ZT8-11 12.3966 12.3966 12.3966 ZT12-15 22.22415 18.05395 26.39435 ZT16-19 27.331899999999997 27.331899999999997 27.331899999999997 ZT20-23 39.9487 39.9487 39.9487