| Age (years)† | | | | | | | | | |
| 9–18 | 911 (52.2) | 738 (62.9) | 475 (53.8) | 591 (66.1) | 589 (45.4) | 1134 (52.2) | 879 (50.7) | 1066 (40.1) | 1506 (61.2) |
| 19–26 | 835 (47.8) | 436 (37.1) | 408 (46.2) | 303 (33.9) | 708 (54.6) | 1039 (47.8) | 855 (49.3) | 1593 (59.9) | 955 (38.8) |
| Mean (SD) | 18.0 (4.4) | 17.3 (4.2) | 17.8 (4.6) | 16.8 (4.3) | 18.8 (4.1) | 18.4 (4.9) | 18.5 (4.8) | 19.7 (4.4) | 17.3 (4.6) |
| Race† | | | | | | | | | |
| White | 1175 (67.3) | 1116 (95.1) | 512 (58.0) | 778 (87.0) | 445 (34.3) | 210 (9.7) | 354 (20.4) | 611 (23.0) | 262 (10.6) |
| African American | 331 (19.0) | 9 (0.8) | 90 (10.2) | 10 (1.1) | 661 (51.0) | 450 (20.7) | 208 (12.0) | 1184 (44.5) | 1115 (45.3) |
| Other | 233 (13.3) | 37 (3.2) | 250 (28.3) | 69 (7.7) | 180 (13.9) | 548 (25.2) | 619 (35.7) | 301 (11.3) | 175 (7.1) |
| Missing | 7 (0.4) | 12 (1.0) | 31 (3.5) | 37 (4.1) | 11 (0.8) | 965 (44.4) | 553 (31.9) | 563 (21.2) | 909 (36.9) |
| HPV vaccine given during study period | | | | | | | | | |
| 0 | 1169 (67.0) | 729 (62.1) | 652 (73.8) | 594 (66.4) | 755 (58.2) | 1602 (73.7) | 1160 (66.9) | 2114 (79.5) | 2227 (90.5) |
| 1 | 102 (5.8) | 87 (7.4) | 40 (4.5) | 58 (6.5) | 169 (13.0) | 255 (11.7) | 238 (13.7) | 218 (8.2) | 121 (4.9) |
| 2 | 114 (6.5) | 66 (5.6) | 52 (5.9) | 42 (4.7) | 157 (12.1) | 182 (8.4) | 187 (10.8) | 154 (5.8) | 65 (2.6) |
| 3 | 360 (20.6) | 292 (24.9) | 136 (15.4) | 199 (22.3) | 212 (16.3) | 129 (5.9) | 147 (8.5) | 168 (6.3) | 48 (2.0) |
| >3 | 1 (0.1) | 0 (0.0) | 3 (0.3) | 1 (0.1) | 4 (0.3) | 5 (0.2) | 2 (0.1) | 5 (0.2) | 0 (0.0) |