condition mean min max ZT0-3 1.75846 1.75846 1.75846 ZT4-7 1.26736 1.26736 1.26736 ZT8-11 1.32076 1.32076 1.32076 ZT12-15 1.5779 1.5779 1.5779 ZT16-19 1.84822 1.84822 1.84822 ZT20-23 2.30397 2.30397 2.30397