condition mean min max ZT0-3 0.03814468333333333 0.0 0.0858028 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.06336205 0.0312176 0.0955065 ZT16-19 0.02781935 0.02781935 0.02781935 ZT20-23 0.03025125 0.03025125 0.03025125