condition mean min max ZT0-3 0.6628642499999999 0.42794 0.8977885 ZT4-7 0.8625999999999999 0.8625999999999999 0.8625999999999999 ZT8-11 0.7824220000000001 0.7824220000000001 0.7824220000000001 ZT12-15 0.70660625 0.440668 0.9725445 ZT16-19 0.9961375 0.6688666666666667 1.3234083333333333 ZT20-23 0 0 0