condition mean min max ZT0-3 69.39955 69.39955 69.39955 ZT4-7 46.003299999999996 46.003299999999996 46.003299999999996 ZT8-11 32.08425 32.08425 32.08425 ZT12-15 33.843450000000004 33.843450000000004 33.843450000000004 ZT16-19 61.03425 61.03425 61.03425 ZT20-23 69.41460000000001 69.41460000000001 69.41460000000001