condition mean min max ZT0-3 61.799825 57.82135 65.7783 ZT4-7 45.47925 45.47925 45.47925 ZT8-11 46.4626 46.4626 46.4626 ZT12-15 0 0 0 ZT16-19 70.3468 70.3468 70.3468 ZT20-23 63.128750000000004 63.128750000000004 63.128750000000004