condition mean min max ZT0-3 33.385773 33.385773 33.385773 ZT4-7 20.3554575 20.3554575 20.3554575 ZT8-11 26.109022500000002 26.109022500000002 26.109022500000002 ZT12-15 84.187848 84.187848 84.187848 ZT16-19 110.46870799999999 110.46870799999999 110.46870799999999 ZT20-23 204.382116 204.382116 204.382116