condition mean min max ZT0-3 3.5682074999999998 3.262185 3.87423 ZT4-7 2.16067 2.16067 2.16067 ZT8-11 2.3381 2.3381 2.3381 ZT12-15 0 0 0 ZT16-19 3.9785000000000004 3.9785000000000004 3.9785000000000004 ZT20-23 2.985715 2.985715 2.985715