condition mean min max ZT0-3 1.5405 1.5405 1.5405 ZT4-7 1.367934 1.367934 1.367934 ZT8-11 3.2772699999999997 3.2772699999999997 3.2772699999999997 ZT12-15 3.119055 3.119055 3.119055 ZT16-19 3.2914950000000003 3.2914950000000003 3.2914950000000003 ZT20-23 0.9955094999999999 0.9955094999999999 0.9955094999999999