condition mean min max ZT0-3 11.528765 11.528765 11.528765 ZT4-7 12.960013499999999 12.960013499999999 12.960013499999999 ZT8-11 14.4722015 14.4722015 14.4722015 ZT12-15 12.064486500000001 12.064486500000001 12.064486500000001 ZT16-19 11.885333500000002 11.885333500000002 11.885333500000002 ZT20-23 10.7818155 10.7818155 10.7818155