condition mean min max ZT0-3 29.731575 24.198700000000002 35.26445 ZT4-7 36.2014 36.2014 36.2014 ZT8-11 45.6554 45.6554 45.6554 ZT12-15 0 0 0 ZT16-19 49.41815 49.41815 49.41815 ZT20-23 48.15125 48.15125 48.15125