condition mean min max ZT0-3 2.34524 2.34524 2.34524 ZT4-7 2.49845 2.49845 2.49845 ZT8-11 1.2542749999999998 1.2542749999999998 1.2542749999999998 ZT12-15 1.93011 1.93011 1.93011 ZT16-19 3.235245 3.235245 3.235245 ZT20-23 2.0951 2.0951 2.0951