condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 9.572635 9.572635 9.572635 ZT8-11 10.327365499999999 10.327365499999999 10.327365499999999 ZT12-15 11.570554 11.570554 11.570554 ZT16-19 9.976530499999999 9.976530499999999 9.976530499999999 ZT20-23 11.2133165 11.2133165 11.2133165