condition mean min max ZT0-3 0.17138816666666665 0.0 0.33219 ZT4-7 0.8932605 0.8932605 0.8932605 ZT8-11 1.858295 1.858295 1.858295 ZT12-15 1.778689 0.7989280000000001 2.75845 ZT16-19 0.671825 0.671825 0.671825 ZT20-23 0.458486 0.458486 0.458486