condition mean min max ZT0-3 96.458673 96.458673 96.458673 ZT4-7 77.21117050000001 77.21117050000001 77.21117050000001 ZT8-11 47.328218 47.328218 47.328218 ZT12-15 44.035087000000004 44.035087000000004 44.035087000000004 ZT16-19 69.761357 69.761357 69.761357 ZT20-23 157.330833 157.330833 157.330833