condition mean min max ZT0-3 18.4693 18.4693 18.4693 ZT4-7 12.539100000000001 12.539100000000001 12.539100000000001 ZT8-11 15.82505 15.82505 15.82505 ZT12-15 22.9418 22.9418 22.9418 ZT16-19 25.0684 25.0684 25.0684 ZT20-23 23.49675 23.49675 23.49675