condition mean min max ZT0-3 13.5349 13.5349 13.5349 ZT4-7 12.5244 12.5244 12.5244 ZT8-11 11.46815 11.46815 11.46815 ZT12-15 8.771075 8.771075 8.771075 ZT16-19 10.14798 10.14798 10.14798 ZT20-23 11.82805 11.82805 11.82805