condition mean min max ZT0-3 61.470616666666665 46.61425 76.29425 ZT4-7 57.10765 57.10765 57.10765 ZT8-11 45.3382 45.3382 45.3382 ZT12-15 54.993525 53.08085 56.9062 ZT16-19 49.2859 49.2859 49.2859 ZT20-23 68.45155 68.45155 68.45155