condition mean min max ZT0-3 28.907925 25.2998 32.51605 ZT4-7 17.21205 17.21205 17.21205 ZT8-11 22.84585 22.84585 22.84585 ZT12-15 0 0 0 ZT16-19 47.21465 47.21465 47.21465 ZT20-23 39.22795 39.22795 39.22795