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 0.0340268875 0.0 0.068053775 ZT16-19 0.11843466666666666 0.0 0.23686933333333332 ZT20-23 0 0 0