condition mean min max ZT0-3 614.454382 614.454382 614.454382 ZT4-7 2027.6081075 2027.6081075 2027.6081075 ZT8-11 2705.5182485 2705.5182485 2705.5182485 ZT12-15 2318.50123 2318.50123 2318.50123 ZT16-19 1622.2648519999998 1622.2648519999998 1622.2648519999998 ZT20-23 1349.8713275 1349.8713275 1349.8713275