condition mean min max ZT0-3 6.87953 6.87953 6.87953 ZT4-7 4.469200000000001 4.469200000000001 4.469200000000001 ZT8-11 4.094555 4.094555 4.094555 ZT12-15 4.88173 4.88173 4.88173 ZT16-19 6.627585 6.627585 6.627585 ZT20-23 6.878425 6.878425 6.878425