condition mean min max ZT0-3 4.87784 4.308795 5.446885 ZT4-7 8.84886 8.84886 8.84886 ZT8-11 6.6898 6.6898 6.6898 ZT12-15 0 0 0 ZT16-19 6.52375 6.52375 6.52375 ZT20-23 6.936590000000001 6.936590000000001 6.936590000000001