condition mean min max ZT0-3 13.6584 13.6584 13.6584 ZT4-7 12.95725 12.95725 12.95725 ZT8-11 11.7116 11.7116 11.7116 ZT12-15 10.74004 10.74004 10.74004 ZT16-19 15.639 15.639 15.639 ZT20-23 16.739 16.739 16.739