condition mean min max ZT0-3 5.4626422452500005 4.387214613 6.5380698775 ZT4-7 8.49309809475 8.421293596 8.5649025935 ZT8-11 5.85880313725 5.6979100560000004 6.0196962185 ZT12-15 8.40731776025 6.7571839525 10.057451568000001 ZT16-19 11.843870325 11.209130615 12.478610034999999 ZT20-23 12.187981982500002 12.15087907 12.225084895000002