condition mean min max ZT0-3 55.6 55.6 55.6 ZT4-7 56.1 56.1 56.1 ZT8-11 58.4 58.4 58.4 ZT12-15 48.599999999999994 48.599999999999994 48.599999999999994 ZT16-19 48.35 48.35 48.35 ZT20-23 36.4 36.4 36.4