condition mean min max ZT0-3 12.013323 12.013323 12.013323 ZT4-7 12.3849225 12.3849225 12.3849225 ZT8-11 12.033706500000001 12.033706500000001 12.033706500000001 ZT12-15 12.47499 12.47499 12.47499 ZT16-19 13.0592825 13.0592825 13.0592825 ZT20-23 13.7224595 13.7224595 13.7224595