condition mean min max ZT0-3 6.43684 4.96411 7.90957 ZT4-7 7.25449 7.25449 7.25449 ZT8-11 37.55625 37.55625 37.55625 ZT12-15 0 0 0 ZT16-19 36.759249999999994 36.759249999999994 36.759249999999994 ZT20-23 18.92085 18.92085 18.92085