condition mean min max ZT0-3 0.6554421666666667 0.502345 0.8397785 ZT4-7 1.0196645 1.0196645 1.0196645 ZT8-11 0.723801 0.723801 0.723801 ZT12-15 0.96278825 0.8069265 1.11865 ZT16-19 0.7018575 0.7018575 0.7018575 ZT20-23 0.6922775 0.6922775 0.6922775