condition mean min max ZT0-3 189.155134 189.155134 189.155134 ZT4-7 118.9093515 118.9093515 118.9093515 ZT8-11 90.26264649999999 90.26264649999999 90.26264649999999 ZT12-15 86.739186 86.739186 86.739186 ZT16-19 66.1992915 66.1992915 66.1992915 ZT20-23 55.775065999999995 55.775065999999995 55.775065999999995