condition mean min max ZT0-3 64.28348333333334 18.6142 92.5678 ZT4-7 17.25955 17.25955 17.25955 ZT8-11 15.796000000000001 15.796000000000001 15.796000000000001 ZT12-15 22.70845 16.083849999999998 29.33305 ZT16-19 42.582049999999995 42.582049999999995 42.582049999999995 ZT20-23 74.7483 74.7483 74.7483