condition mean min max ZT0-3 27.650521 27.650521 27.650521 ZT4-7 31.099173999999998 31.099173999999998 31.099173999999998 ZT8-11 43.171314499999994 43.171314499999994 43.171314499999994 ZT12-15 89.166353 89.166353 89.166353 ZT16-19 184.092403 184.092403 184.092403 ZT20-23 226.90946250000002 226.90946250000002 226.90946250000002