condition mean min max ZT0-3 9.514929 9.514929 9.514929 ZT4-7 13.691155 13.691155 13.691155 ZT8-11 9.450037 9.450037 9.450037 ZT12-15 10.0226835 10.0226835 10.0226835 ZT16-19 9.3602185 9.3602185 9.3602185 ZT20-23 9.5296715 9.5296715 9.5296715