condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.027595570833333333 0.020950475 0.03424066666666666 ZT16-19 0.0591635 0.0 0.118327 ZT20-23 0 0 0