condition mean min max ZT0-3 0.0370935 0.0 0.0588565 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0539345 0.0539345 0.0539345 ZT12-15 0.08257275 0.0 0.1651455 ZT16-19 0.052292 0.052292 0.052292 ZT20-23 0.0 0.0 0.0