condition mean min max ZT0-3 3.004205 3.004205 3.004205 ZT4-7 1.065563 1.065563 1.065563 ZT8-11 1.18301 1.18301 1.18301 ZT12-15 3.580225 3.580225 3.580225 ZT16-19 6.10513 6.10513 6.10513 ZT20-23 4.77558 4.77558 4.77558