condition mean min max ZT0-3 19.821554 19.821554 19.821554 ZT4-7 19.2080355 19.2080355 19.2080355 ZT8-11 18.493649 18.493649 18.493649 ZT12-15 18.82249 18.82249 18.82249 ZT16-19 16.48633 16.48633 16.48633 ZT20-23 18.423004499999998 18.423004499999998 18.423004499999998