condition mean min max ZT0-3 12.19295 11.9055 12.4804 ZT4-7 11.772749999999998 11.772749999999998 11.772749999999998 ZT8-11 15.44765 15.44765 15.44765 ZT12-15 0 0 0 ZT16-19 16.380850000000002 16.380850000000002 16.380850000000002 ZT20-23 14.8096 14.8096 14.8096