condition mean min max ZT0-3 0.024814376 0.0 0.049628752 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.08282521416666666 0.058774684333333334 0.106875744 ZT20-23 0.0 0.0 0.0