condition mean min max ZT0-3 29.992983333333335 19.6732 35.587450000000004 ZT4-7 15.254650000000002 15.254650000000002 15.254650000000002 ZT8-11 11.498194999999999 11.498194999999999 11.498194999999999 ZT12-15 13.4367225 11.923995000000001 14.949449999999999 ZT16-19 18.9591 18.9591 18.9591 ZT20-23 31.15685 31.15685 31.15685