| Characteristic | Complete follow-up (n = 102) | Without complete follow-up (n = 262) | p Value |
| Age group | |||
| <12 months | 99 (97.1) | 220 (84.0) | <0.01 |
| 12–48 months | 3 (2.9) | 42 (16.0) | |
| Sex | |||
| Male | 52 (51.0) | 132 (50.4) | 0.92 |
| Female | 50 (49.0) | 130 (49.6) | |
| Race/ethnicity | 0.23 | ||
| African American | 87 (85.3) | 238 (90.8) | |
| White | 8 (7.8) | 10 (3.8) | |
| Other | 7 (6.9) | 14 (5.3) | |
| Insurance | <0.01* | ||
| Public | 75 (73.5) | 216 (82.4) | |
| Private | 25 (24.5) | 23 (8.8) | |
| Self/none | 1 (1.0) | 4 (1.5) | |
| Unknown | 1 (1.0) | 19 (7.3) |
Values are number (%). Percentages within some categories do not add up to 100 because of rounding. Except where indicated, the p value was from Pearson’s χ2 test.
*Fisher’s exact test.