condition mean min max ZT0-3 54.521162 54.521162 54.521162 ZT4-7 72.674323 72.674323 72.674323 ZT8-11 88.7593445 88.7593445 88.7593445 ZT12-15 79.47438149999999 79.47438149999999 79.47438149999999 ZT16-19 119.35850099999999 119.35850099999999 119.35850099999999 ZT20-23 155.273897 155.273897 155.273897