condition mean min max ZT0-3 1.7371 1.18512 2.324945 ZT4-7 0.787264 0.787264 0.787264 ZT8-11 1.217155 1.217155 1.217155 ZT12-15 2.3325774999999997 1.993295 2.6718599999999997 ZT16-19 2.60295 2.60295 2.60295 ZT20-23 2.7664299999999997 2.7664299999999997 2.7664299999999997