condition mean min max ZT0-3 0.47088833333333335 0.0 1.412665 ZT4-7 0.0 0.0 0.0 ZT8-11 0.65721 0.65721 0.65721 ZT12-15 0.2881725 0.0 0.576345 ZT16-19 1.085075 1.085075 1.085075 ZT20-23 0.0 0.0 0.0