Figure 1.

Distribution of values found for the hydroxyproline content, the total hexuronate (and thus proteoglycan) content and the total hyaluronan content of cartilage explants with moderate and severe osteoarthritis that were cultured in the absence of nonsteroidal anti-inflammatory drugs. The horizonal line present in each column scatter corresponds to the median value. The Mann–Whitney U-test disclosed that the two groups had a similar median content of hydroxyproline (U=149; P=0.1718) but differed in their median content of hexuronate (U=34; P<0.0001) and in their median content of hyaluronan (U=0; P<0.0001).