condition mean min max ZT0-3 1.611946 0.863783 2.92218 ZT4-7 0.804062 0.804062 0.804062 ZT8-11 0.1864405 0.1864405 0.1864405 ZT12-15 0.23042425000000002 0.160341 0.30050750000000004 ZT16-19 0.0840464 0.0840464 0.0840464 ZT20-23 0.17135899999999998 0.17135899999999998 0.17135899999999998