condition mean min max ZT0-3 18.885798333333334 4.013995 28.8352 ZT4-7 0.7288209999999999 0.7288209999999999 0.7288209999999999 ZT8-11 0.16242 0.16242 0.16242 ZT12-15 0.02698575 0.0 0.0539715 ZT16-19 0.2034505 0.2034505 0.2034505 ZT20-23 0.4570075 0.4570075 0.4570075