condition mean min max ZT0-3 0.459067 0.459067 0.459067 ZT4-7 1.0306199999999999 1.0306199999999999 1.0306199999999999 ZT8-11 0.917375 0.917375 0.917375 ZT12-15 1.3893650000000002 1.3893650000000002 1.3893650000000002 ZT16-19 0.7112015 0.7112015 0.7112015 ZT20-23 0.60844 0.60844 0.60844