condition mean min max ZT0-3 1.7370549999999998 1.7370549999999998 1.7370549999999998 ZT4-7 1.2012800000000001 1.2012800000000001 1.2012800000000001 ZT8-11 1.0078015 1.0078015 1.0078015 ZT12-15 1.4569 1.4569 1.4569 ZT16-19 1.772465 1.772465 1.772465 ZT20-23 2.25631 2.25631 2.25631