condition mean min max ZT0-3 128.25913333333332 99.3555 181.7055 ZT4-7 166.7475 166.7475 166.7475 ZT8-11 129.114 129.114 129.114 ZT12-15 90.455625 90.1191 90.79214999999999 ZT16-19 67.89055 67.89055 67.89055 ZT20-23 67.2088 67.2088 67.2088