condition mean min max ZT0-3 1.99839 1.99839 1.99839 ZT4-7 1.2219255 1.2219255 1.2219255 ZT8-11 1.9947599999999999 1.9947599999999999 1.9947599999999999 ZT12-15 1.96395 1.96395 1.96395 ZT16-19 2.3080833333333333 2.3080833333333333 2.3080833333333333 ZT20-23 1.9308999999999998 1.9308999999999998 1.9308999999999998