condition mean min max ZT0-3 1.4559675 1.402155 1.5097800000000001 ZT4-7 1.540815 1.540815 1.540815 ZT8-11 1.45206 1.45206 1.45206 ZT12-15 0 0 0 ZT16-19 1.729875 1.729875 1.729875 ZT20-23 1.5505550000000001 1.5505550000000001 1.5505550000000001