Table 1.
Demographics of cases and controls.
| Characteristics | Total (n=1267) |
Cases n=857 |
Controls n=410 |
p-value |
|---|---|---|---|---|
| Sex: Female, n (%) | 636 (50) | 448 (52) | 188(45) | 0.03 |
| Age, months, median (IQR) | 24 (11–57) | 24 (11–57) | 24 (10.2–57) | 0.7 |
| Age by category, n (%) | ||||
| 0–12 months | 347(27) | 236 (28) | 111(27) | |
| 13–24 months | 282(22) | 189(22) | 93(23) | 0.9 |
| 25–60 months | 339(27) | 231(27) | 108(26) | |
| > 60 months | 299(23) | 201(23) | 98(23) | |
| Race, n (%) | ||||
| White | 792 (62.5) | 534 (62) | 258 (63) | 0.6 |
| Black | 450 (35.5) | 306 (35) | 144 (35) | |
| Asian | 20 (1.58) | 12 (1.5) | 8 (2) | |
| Hawaiian | 1 (0.08) | 1 (0.08) | 0 (0) | |
| Other | 4 (0.32) | 4 (0.47) | 0 (0) | |
| Ethnicity, n (%) | ||||
| Hispanic | 481 (38) | 321(38) | 160 (40) | 0.59 |
| Non-Hispanic | 786 (62) | 536 (62) | 250 (60) | |
| Annual Household Income a, n (%) | ||||
| Less than $ 25 000, | 711 (56) | 464 (54) | 247(60) | 0.03 |
| Between $ 25 000 to 75 000 | 214 (16) | 127(14) | 87(21) | |
| More than 75 000 | 40 (3) | 35(4) | 5(1) | |
| Maternal Education b, n (%) | ||||
| Less than high school | 374 (29) | 244 (28) | 130 (31) | 0.7 |
| High School | 540 (42) | 364 (42) | 176 (42) | |
| College degree and above | 298 (23) | 200 (23) | 98 (24) | |
| Insurance c n (%) | ||||
| Public | 1071 (84) | 708 (82) | 363 (88) | 0.02 |
| Private | 151 (12) | 113(13) | 38(9) | |
| Both public and private, | 25 (2) | 17 (2) | 8 (2) | |
All percentages in table are in comparison to totals given at the top of each column. P values were obtained by using Fisher exact test for categorical variables and Wilcoxon-rank test for continuous variable.
a
Data were missing for 23% of participants.
b
Data were missing for 4% of participants.
c
Data were missing for 1% of participants and 0.5% of participants had no insurance