condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.042363573 0.0 0.084727146 ZT12-15 0.02528786625 0.021078360499999997 0.029497372 ZT16-19 0.02550340675 0.0 0.0510068135 ZT20-23 0.0 0.0 0.0