condition mean min max ZT0-3 8.17052 7.08312 9.25792 ZT4-7 11.6198 11.6198 11.6198 ZT8-11 10.58737 10.58737 10.58737 ZT12-15 0 0 0 ZT16-19 10.45225 10.45225 10.45225 ZT20-23 8.682120000000001 8.682120000000001 8.682120000000001