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 0.00846875 0.0 0.0169375 ZT16-19 0.025508166666666665 0.0 0.05101633333333333 ZT20-23 0 0 0