Schymura et al. BMC Cancer 2010, 10:152 http://www.biomedcentral.com/1471-2407/10/152 Page 11 of 15 Table 4: Percentage (%) distributions and odds ratios for receipt of radiation therapy among patients receiving definitive treatment (n = 2,347). Characteristic % Crude 1 OR (95% CI) Adj.2 OR (95% CI) Adj.3 OR (95% CI) Model 1 Model 2 Age-Race/ethnicity Interaction4 <60, Non-Black 1.00 (referent) <60, NH Black 2.98 (1.77 - 4.96) 60-64, Non-Black 2.01 (1.42 - 2.88) 60-64, NH Black 2.80 (1.52 - 5.03) 65-74, Non-Black 7.20 (5.38 - 9.79) 65-74, NH Black 5.14 (3.24 - 8.18) >= 75, Non-Black 68.08 (41.57 - 116.45) >= 75, NH Black 41.09 (13.58 - 178.13) Age at diagnosis <60 17.20 1.00 (referent) 60-64 25.54 1.65 (1.22 - 2.25) 65-69 39.76 3.18 (2.41 - 4.22) 70-74 69.25 10.84 (8.08 - 14.66) >= 75 91.32 50.63 (32.27 - 82.56) Marital status Married 42.30 1.00 (referent) Not Married 49.18 1.32 (1.05 - 1.65) Unknown 60.58 2.10 (1.41 - 3.16) Registry California 36.60 1.00 (referent) Colorado 39.30 1.12 (0.83 - 1.52) Illinois 46.46 1.50 (1.11 - 2.04) Louisiana 38.36 1.08 (0.80 - 1.46) New York 53.80 2.02 (1.49 - 2.75) Rhode Island 49.39 1.69 (1.24 - 2.30) South Carolina 47.66 1.58 (1.14 - 2.19) DRE results Normal 40.28 1.00 (referent) Abnormal 50.67 1.52 (1.26 - 1.84) Equivocal/unknown 41.33 1.05 (0.85 - 1.29) PSA value 0-4 39.52 1.00 (referent) >4-10 41.56 1.09 (0.81 - 1.47) >10-20 53.88 1.79 (1.28 - 2.50) 20+ 61.00 2.40 (1.61 - 3.58) Unknown 29.91 0.65 (0.44 - 0.97) Gleason score 2-4 43.01 1.00 (referent) 5-7 40.92 0.92 (0.68 - 1.24) 8-10 61.05 2.08 (1.39 - 3.13) Unknown 72.48 3.49 (2.12 - 5.86) 1: OR = odds ratio; CI = confidence interval. 2,3: Adjusted for factors shown in the table. 4: NH = Non-Hispanic, non-Black includes all race/ethnic groups other than NH Blacks. 1.00 (referent) 2.62 (1.50 - 4.52) 1.95 (1.36 - 2.83) 2.53 (1.32 - 4.72) 7.55 (5.57 - 10.40) 5.19 (3.15 - 8.59) 69.73 (41.94 - 120.93) 43.31 (13.28 - 196.39) 1.00 (referent) 1.44 (1.10 - 1.88) 2.20 (1.36 - 3.58) 1.00 (referent) 1.57 (1.10 - 2.25) 1.57 (1.09 - 2.27) 1.06 (0.73 - 1.53) 2.40 (1.66 - 3.49) 2.00 (1.39 - 2.90) 2.12 (1.43 - 3.14) 1.00 (referent) 1.19 (0.95 - 1.50) 0.78 (0.60 - 1.02) 1.00 (referent) 1.01 (0.71 - 1.44) 1.57 (1.06 - 2.34) 2.14 (1.34 - 3.45) 0.45 (0.27 - 0.73) 1.00 (referent) 0.76 (0.54 - 1.09) 1.53 (0.94 - 2.48) 5.59 (3.09 - 10.34) 1.00 (referent) 1.63 (1.18 - 2.26) 3.37 (2.52 - 4.54) 12.22 (8.94 - 16.86) 54.47 (34.11 - 90.27) 1.00 (referent) 1.51 (1.15 - 1.98) 2.22 (1.36 - 3.65) 1.00 (referent) 1.60 (1.11 - 2.31) 1.71 (1.17 - 2.49) 1.07 (0.74 - 1.56) 2.78 (1.91 - 4.06) 1.98 (1.36 - 2.89) 2.35 (1.58 - 3.51) 1.00 (referent) 1.17 (0.93 - 1.48) 0.77 (0.59 - 1.00) 1.00 (referent) 1.06 (0.74 - 1.53) 1.64 (1.09 - 2.46) 2.17 (1.35 - 3.52) 0.46 (0.28 - 0.75) 1.00 (referent) 0.76 (0.53 - 1.09) 1.59 (0.97 - 2.62) 5.64 (3.08 - 10.52)