condition mean min max ZT0-3 34.65 34.65 34.65 ZT4-7 3.5 3.5 3.5 ZT8-11 12.65 12.65 12.65 ZT12-15 9.15 9.15 9.15 ZT16-19 21.1 21.1 21.1 ZT20-23 45.099999999999994 45.099999999999994 45.099999999999994