condition mean min max ZT0-3 16.06785 16.06785 16.06785 ZT4-7 9.33262 9.33262 9.33262 ZT8-11 10.1588 10.1588 10.1588 ZT12-15 11.12145 11.12145 11.12145 ZT16-19 16.75925 16.75925 16.75925 ZT20-23 17.8701 17.8701 17.8701