condition mean min max ZT0-3 26.541223 26.541223 26.541223 ZT4-7 27.567660500000002 27.567660500000002 27.567660500000002 ZT8-11 35.0635215 35.0635215 35.0635215 ZT12-15 33.6421715 33.6421715 33.6421715 ZT16-19 35.230795 35.230795 35.230795 ZT20-23 35.793848499999996 35.793848499999996 35.793848499999996