condition mean min max ZT0-3 29.0 29.0 29.0 ZT4-7 17.8 17.8 17.8 ZT8-11 56.099999999999994 56.099999999999994 56.099999999999994 ZT12-15 17.6 17.6 17.6 ZT16-19 17.75 17.75 17.75 ZT20-23 12.0 12.0 12.0