condition mean min max ZT0-3 2.6243125000000003 1.9249100000000001 3.323715 ZT4-7 0.771221 0.771221 0.771221 ZT8-11 2.033765 2.033765 2.033765 ZT12-15 0 0 0 ZT16-19 1.5145499999999998 1.5145499999999998 1.5145499999999998 ZT20-23 2.0924899999999997 2.0924899999999997 2.0924899999999997