condition mean min max ZT0-3 26.400000000000002 26.400000000000002 26.400000000000002 ZT4-7 82.0 82.0 82.0 ZT8-11 51.099999999999994 51.099999999999994 51.099999999999994 ZT12-15 38.45 38.45 38.45 ZT16-19 45.55 45.55 45.55 ZT20-23 72.85 72.85 72.85