White MSM had the highest percentage aware (74% in 2008; 86% in 2011), while black MSM had the lowest percentage aware (41% in 2008; 54% in 2011). In the combined data, black MSM were 40% less likely to be aware of their infection than white MSM (PR =0.60, p,0.0001), as shown in Figure 1b. In addition to black MSM, the lowest percentages of HIV-positive men who were aware of their infection were observed among MSM interviewed in Baltimore (27% in 2008; 31% in 2011) and San Juan, Puerto Rico (28% in 2008; 23% in 2011).