condition mean min max ZT0-3 185.087116 185.087116 185.087116 ZT4-7 179.27313800000002 179.27313800000002 179.27313800000002 ZT8-11 159.44001200000002 159.44001200000002 159.44001200000002 ZT12-15 152.7725945 152.7725945 152.7725945 ZT16-19 177.24999350000002 177.24999350000002 177.24999350000002 ZT20-23 182.5166305 182.5166305 182.5166305