condition mean min max ZT0-3 8.656349940750001 6.7074004915 10.60529939 ZT4-7 8.856744375 6.407222646 11.306266103999999 ZT8-11 15.07033882 13.14319179 16.99748585 ZT12-15 15.997493585 14.894072600000001 17.10091457 ZT16-19 12.462094350000001 11.342774284999999 13.581414415000001 ZT20-23 18.6509400925 18.2011446 19.100735585000002