condition mean min max ZT0-3 36.161375 32.6057 39.71705 ZT4-7 47.5646 47.5646 47.5646 ZT8-11 25.93795 25.93795 25.93795 ZT12-15 0 0 0 ZT16-19 37.58885 37.58885 37.58885 ZT20-23 46.18485 46.18485 46.18485