condition mean min max ZT0-3 10.55 10.55 10.55 ZT4-7 8.1 8.1 8.1 ZT8-11 8.85 8.85 8.85 ZT12-15 13.15 13.15 13.15 ZT16-19 45.599999999999994 45.599999999999994 45.599999999999994 ZT20-23 13.149999999999999 13.149999999999999 13.149999999999999