condition mean min max ZT0-3 514.770518 514.770518 514.770518 ZT4-7 1591.574463 1591.574463 1591.574463 ZT8-11 1367.835015 1367.835015 1367.835015 ZT12-15 703.930063 703.930063 703.930063 ZT16-19 262.5077045 262.5077045 262.5077045 ZT20-23 210.6667515 210.6667515 210.6667515