condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.00887691 0.0 0.01775382 ZT12-15 0.0 0.0 0.0 ZT16-19 0.009795780666666667 0.0 0.019591561333333334 ZT20-23 0.028369566 0.021402436 0.035336696