condition mean min max ZT0-3 12.52795 12.52795 12.52795 ZT4-7 8.791564999999999 8.791564999999999 8.791564999999999 ZT8-11 9.464835 9.464835 9.464835 ZT12-15 12.55955 12.55955 12.55955 ZT16-19 18.37825 18.37825 18.37825 ZT20-23 16.21965 16.21965 16.21965