condition mean min max ZT0-3 25.55 25.55 25.55 ZT4-7 6.1 6.1 6.1 ZT8-11 35.099999999999994 35.099999999999994 35.099999999999994 ZT12-15 5.0 5.0 5.0 ZT16-19 49.5 49.5 49.5 ZT20-23 18.0 18.0 18.0