condition mean min max ZT0-3 2.2624843502375 1.0693650507124999 3.832605 ZT4-7 0.746633456735 0.746633456735 0.746633456735 ZT8-11 2.967155 2.967155 2.967155 ZT12-15 3.3377039999999996 2.577848 4.09756 ZT16-19 1.85831 1.85831 1.85831 ZT20-23 1.9249900000000002 1.9249900000000002 1.9249900000000002