condition mean min max ZT0-3 24.25455 21.372149999999998 27.13695 ZT4-7 25.73205 25.73205 25.73205 ZT8-11 12.29805 12.29805 12.29805 ZT12-15 0 0 0 ZT16-19 21.0265 21.0265 21.0265 ZT20-23 24.450400000000002 24.450400000000002 24.450400000000002