condition mean min max ZT0-3 67.41126666666666 39.85545 114.691 ZT4-7 68.625 68.625 68.625 ZT8-11 23.4023 23.4023 23.4023 ZT12-15 48.541475000000005 46.2326 50.850350000000006 ZT16-19 13.8096 13.8096 13.8096 ZT20-23 28.026249999999997 28.026249999999997 28.026249999999997