condition mean min max ZT0-3 1.035282 0.626216 1.371035 ZT4-7 2.2226749999999997 2.2226749999999997 2.2226749999999997 ZT8-11 76.8689 76.8689 76.8689 ZT12-15 68.3485 51.55635 85.14065 ZT16-19 16.7654 16.7654 16.7654 ZT20-23 3.726775 3.726775 3.726775