condition mean min max ZT0-3 1.0528096666666666 0.777721 1.273425 ZT4-7 1.099665 1.099665 1.099665 ZT8-11 1.053051 1.053051 1.053051 ZT12-15 1.40577 1.3325749999999998 1.478965 ZT16-19 1.237275 1.237275 1.237275 ZT20-23 1.4383149999999998 1.4383149999999998 1.4383149999999998