condition mean min max ZT0-3 30.95 30.95 30.95 ZT4-7 20.1 20.1 20.1 ZT8-11 10.0 10.0 10.0 ZT12-15 45.099999999999994 45.099999999999994 45.099999999999994 ZT16-19 8.85 8.85 8.85 ZT20-23 8.0 8.0 8.0