condition mean min max ZT0-3 27.8204 27.8204 27.8204 ZT4-7 27.9949 27.9949 27.9949 ZT8-11 24.83135 24.83135 24.83135 ZT12-15 22.25475 22.25475 22.25475 ZT16-19 26.386400000000002 26.386400000000002 26.386400000000002 ZT20-23 21.9883 21.9883 21.9883