condition mean min max ZT0-3 3.87786 3.87786 3.87786 ZT4-7 2.16282 2.16282 2.16282 ZT8-11 2.6068550000000004 2.6068550000000004 2.6068550000000004 ZT12-15 3.4418800000000003 3.4418800000000003 3.4418800000000003 ZT16-19 4.3401 4.3401 4.3401 ZT20-23 4.2376450000000006 4.2376450000000006 4.2376450000000006