condition mean min max ZT0-3 0.24064633675000002 0.070225211 0.41106746250000004 ZT4-7 3.1513487629999997 1.5771809565 4.7255165695 ZT8-11 13.150281346249999 10.2020035175 16.098559175 ZT12-15 19.971055115 17.929957844999997 22.012152385 ZT16-19 14.576497082500001 14.431342135 14.721652030000001 ZT20-23 17.10976774 15.81918528 18.4003502