condition mean min max ZT0-3 2.1125225 1.55651 2.668535 ZT4-7 1.60779 1.60779 1.60779 ZT8-11 2.1562200000000002 2.1562200000000002 2.1562200000000002 ZT12-15 0 0 0 ZT16-19 4.490105 4.490105 4.490105 ZT20-23 1.988535 1.988535 1.988535