condition mean min max ZT0-3 2.4497535 2.4497535 2.4497535 ZT4-7 0.220851 0.220851 0.220851 ZT8-11 0.0596445 0.0596445 0.0596445 ZT12-15 0.557473 0.557473 0.557473 ZT16-19 0.510278 0.510278 0.510278 ZT20-23 3.941815 3.941815 3.941815