condition mean min max ZT0-3 29.7875281775 28.26584734 31.309209015 ZT4-7 25.69489264 25.485127040000002 25.90465824 ZT8-11 26.820789785000002 26.792619900000002 26.84895967 ZT12-15 28.060154145 26.86231344 29.25799485 ZT16-19 29.91790527166667 29.822762673333333 30.01304787 ZT20-23 31.155802125 30.74200228 31.56960197