condition mean min max ZT0-3 54.099999999999994 54.099999999999994 54.099999999999994 ZT4-7 57.2 57.2 57.2 ZT8-11 24.45 24.45 24.45 ZT12-15 30.650000000000002 30.650000000000002 30.650000000000002 ZT16-19 55.5 55.5 55.5 ZT20-23 38.1 38.1 38.1