condition mean min max ZT0-3 21.7521924075 21.60261261 21.901772205 ZT4-7 24.15781951 19.63203837 28.68360065 ZT8-11 25.445969372500002 23.423052845 27.4688859 ZT12-15 33.9089161375 31.34105662 36.476775655 ZT16-19 29.5568037175 28.866493225 30.24711421 ZT20-23 24.70513746 24.52981251 24.88046241