condition mean min max ZT0-3 0.0218113965 0.0 0.043622793 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.010979396333333334 0.0 0.021958792666666668 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0