condition mean min max ZT0-3 10.346104 10.346104 10.346104 ZT4-7 8.909742000000001 8.909742000000001 8.909742000000001 ZT8-11 9.302313000000002 9.302313000000002 9.302313000000002 ZT12-15 9.668355 9.668355 9.668355 ZT16-19 10.581316999999999 10.581316999999999 10.581316999999999 ZT20-23 10.933159 10.933159 10.933159