condition mean min max ZT0-3 3.42726 2.2785599999999997 4.0933600000000006 ZT4-7 2.76798 2.76798 2.76798 ZT8-11 1.087901 1.087901 1.087901 ZT12-15 1.8432295 1.738146 1.948313 ZT16-19 2.239775 2.239775 2.239775 ZT20-23 3.926825 3.926825 3.926825