condition mean min max ZT0-3 1.5998122499999998 1.2335794999999998 1.9660449999999998 ZT4-7 1.3592300000000002 1.3592300000000002 1.3592300000000002 ZT8-11 1.028285 1.028285 1.028285 ZT12-15 0 0 0 ZT16-19 1.7025635000000001 1.7025635000000001 1.7025635000000001 ZT20-23 1.5768749999999998 1.5768749999999998 1.5768749999999998