condition mean min max ZT0-3 40.771666 40.771666 40.771666 ZT4-7 117.136829 117.136829 117.136829 ZT8-11 170.9701795 170.9701795 170.9701795 ZT12-15 87.3001495 87.3001495 87.3001495 ZT16-19 52.096831 52.096831 52.096831 ZT20-23 41.9397935 41.9397935 41.9397935