condition mean min max ZT0-3 4.592698833333333 0.6503535 12.3264 ZT4-7 6.567155 6.567155 6.567155 ZT8-11 1.498475 1.498475 1.498475 ZT12-15 5.9482675 2.6556699999999998 9.240865 ZT16-19 1.60242 1.60242 1.60242 ZT20-23 1.4788700000000001 1.4788700000000001 1.4788700000000001