condition mean min max ZT0-3 0.011312875 0.0 0.02262575 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.009313983333333333 0.0 0.018627966666666666 ZT16-19 0.00736545 0.0 0.0147309 ZT20-23 0 0 0