condition mean min max ZT0-3 12.341 12.341 12.341 ZT4-7 10.198025000000001 10.198025000000001 10.198025000000001 ZT8-11 8.433795 8.433795 8.433795 ZT12-15 10.615015 10.615015 10.615015 ZT16-19 13.96615 13.96615 13.96615 ZT20-23 11.933800000000002 11.933800000000002 11.933800000000002