condition mean min max ZT0-3 4.394118333333333 0.0 13.182355 ZT4-7 8.26655 8.26655 8.26655 ZT8-11 0.0 0.0 0.0 ZT12-15 4.81325 0.0 9.6265 ZT16-19 8.25878 8.25878 8.25878 ZT20-23 0.0 0.0 0.0