condition mean min max ZT0-3 14.89105 12.42845 17.353650000000002 ZT4-7 15.9191 15.9191 15.9191 ZT8-11 38.66875 38.66875 38.66875 ZT12-15 0 0 0 ZT16-19 40.47945 40.47945 40.47945 ZT20-23 19.921950000000002 19.921950000000002 19.921950000000002