condition mean min max ZT0-3 10.60371 10.60371 10.60371 ZT4-7 11.457175 11.457175 11.457175 ZT8-11 13.381974 13.381974 13.381974 ZT12-15 10.3793635 10.3793635 10.3793635 ZT16-19 11.244114 11.244114 11.244114 ZT20-23 11.1487675 11.1487675 11.1487675