condition mean min max ZT0-3 5.4956175 5.234495 5.75674 ZT4-7 3.7689700000000004 3.7689700000000004 3.7689700000000004 ZT8-11 5.548864999999999 5.548864999999999 5.548864999999999 ZT12-15 0 0 0 ZT16-19 7.77708 7.77708 7.77708 ZT20-23 7.94647 7.94647 7.94647