condition mean min max ZT0-3 0.0135679 0.0135679 0.0135679 ZT4-7 0.01577565 0.01577565 0.01577565 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0139493 0.0139493 0.0139493 ZT20-23 0.0411019 0.0411019 0.0411019