condition mean min max ZT0-3 29.73885 29.2672 30.210500000000003 ZT4-7 30.063 30.063 30.063 ZT8-11 22.0135 22.0135 22.0135 ZT12-15 0 0 0 ZT16-19 24.5039 24.5039 24.5039 ZT20-23 34.225899999999996 34.225899999999996 34.225899999999996