condition mean min max ZT0-3 0.49137000000000003 0.49137000000000003 0.49137000000000003 ZT4-7 0.647163 0.647163 0.647163 ZT8-11 0.6672659999999999 0.6672659999999999 0.6672659999999999 ZT12-15 0.8601525000000001 0.8601525000000001 0.8601525000000001 ZT16-19 0.7146825 0.7146825 0.7146825 ZT20-23 0.6153795 0.6153795 0.6153795