condition mean min max ZT0-3 59.599999999999994 59.599999999999994 59.599999999999994 ZT4-7 46.9 46.9 46.9 ZT8-11 61.5 61.5 61.5 ZT12-15 57.5 57.5 57.5 ZT16-19 74.5 74.5 74.5 ZT20-23 73.0 73.0 73.0