condition mean min max ZT0-3 41.55 41.55 41.55 ZT4-7 57.8 57.8 57.8 ZT8-11 55.599999999999994 55.599999999999994 55.599999999999994 ZT12-15 67.35 67.35 67.35 ZT16-19 55.9 55.9 55.9 ZT20-23 58.0 58.0 58.0