condition mean min max ZT0-3 1.1466355 0.864688 1.428583 ZT4-7 1.7804499999999999 1.7804499999999999 1.7804499999999999 ZT8-11 1.85772 1.85772 1.85772 ZT12-15 0 0 0 ZT16-19 2.773275 2.773275 2.773275 ZT20-23 3.10455 3.10455 3.10455