condition mean min max ZT0-3 14.3964 14.3964 14.3964 ZT4-7 10.91565 10.91565 10.91565 ZT8-11 9.423805 9.423805 9.423805 ZT12-15 13.6108 13.6108 13.6108 ZT16-19 17.01765 17.01765 17.01765 ZT20-23 16.6939 16.6939 16.6939