condition mean min max ZT0-3 12.93637525925 12.577318418499999 13.2954321 ZT4-7 2.6787563 1.8350938669999999 3.5224187330000003 ZT8-11 2.8564547622500003 1.7133521845000002 3.99955734 ZT12-15 7.695431538749999 5.9583302095 9.432532868 ZT16-19 7.3377692332499995 6.676292630999999 7.9992458355 ZT20-23 10.8491253735 10.473540427 11.22471032