condition mean min max ZT0-3 42.919675 41.96169999999999 43.87765 ZT4-7 38.7595 38.7595 38.7595 ZT8-11 44.5666 44.5666 44.5666 ZT12-15 0 0 0 ZT16-19 47.0917 47.0917 47.0917 ZT20-23 44.626850000000005 44.626850000000005 44.626850000000005