condition mean min max ZT0-3 1.9217846762500002 1.2358891525 2.6076802000000003 ZT4-7 0.11071821074999999 0.0 0.22143642149999998 ZT8-11 24.697827505750002 2.4859296300000002 46.9097253815 ZT12-15 66.14037941750001 64.74143066 67.53932817500001 ZT16-19 26.376753686 19.171073937 33.582433435 ZT20-23 6.20655479725 3.6704877309999997 8.7426218635