condition mean min max ZT0-3 12.369953 12.369953 12.369953 ZT4-7 13.7820015 13.7820015 13.7820015 ZT8-11 14.5103135 14.5103135 14.5103135 ZT12-15 12.968522499999999 12.968522499999999 12.968522499999999 ZT16-19 11.358081 11.358081 11.358081 ZT20-23 11.4105415 11.4105415 11.4105415