condition mean min max ZT0-3 31.9 31.9 31.9 ZT4-7 47.1 47.1 47.1 ZT8-11 67.05 67.05 67.05 ZT12-15 61.650000000000006 61.650000000000006 61.650000000000006 ZT16-19 57.2 57.2 57.2 ZT20-23 40.099999999999994 40.099999999999994 40.099999999999994