condition mean min max ZT0-3 1.2633670000000001 1.25369 1.273044 ZT4-7 0.63382 0.63382 0.63382 ZT8-11 3.091635 3.091635 3.091635 ZT12-15 0 0 0 ZT16-19 3.54445 3.54445 3.54445 ZT20-23 1.4662899999999999 1.4662899999999999 1.4662899999999999