Table 3.
Characteristics of childhood cancer cases and controls
| Variable | Category | Cases (%) | Controls (%) |
|---|---|---|---|
| Age at diagnosis (cases) | 28 days - 4 years | 10977 (62.1) | |
| 5 – 9 years | 3403 (19.3) | ||
| 10 – 14 years | 3292 (18.6) | ||
| Mean (SD) (months) | 62.42 (50.80) | ||
| Maternal characteristics | |||
| Age at delivery (years) | < 20 | 1821 (10.3) | 6220 (10.7) |
| 20-24 | 4448 (25.2) | 15268 (26.3) | |
| 25-29 | 5682 (32.2) | 18427 (31.8) | |
| 30-34 | 3908 (22.1) | 12521 (21.6) | |
| 35-39 | 1537 (8.7) | 4670 (8.1) | |
| ≥ 40 | 270 (1.5) | 839 (1.4) | |
| Mean (SD) | 26.91 (5.70) | 26.71(5.67) | |
| Missing | 6 | 21 | |
| Education (years) | < 12 | 2482 (20.2) | 7246 (19.2) |
| 12 | 4346 (35.4) | 13586 (36.1) | |
| 13-16 | 4381 (35.7) | 13815 (36.7) | |
| ≥17 | 1053 (8.6) | 3017 (8.0) | |
| Mean (SD)* | 12.66 (2.88) | 12.71 (2.79) | |
| Missing | 5410 | 20302 | |
| Race | White | 15243 (87.8) | 48568 (85.1) |
| Black | 1147 (6.6) | 3478 (6.1) | |
| Asian | 694 (4.0) | 2590 (4.5) | |
| Other | 284 (1.6) | 2448 (4.3) | |
| Missing | 304 | 882 | |
| Child's characteristics | |||
| Sex | Male | 9728 (55.1) | 30573 (52.8) |
| Female | 7942 (44.9) | 27383 (47.2) | |
| Missing | 2 | 10 | |
| Birth weight (grams) | < 1,500 | 155 (0.9) | 411 (0.7) |
| 1,500-1,999 | 204 (1.2) | 634 (1.1) | |
| 2,000-2,499 | 639 (3.7) | 2108 (3.7) | |
| ≥ 2,500 | 16436 (94.3) | 54438 (94.5) | |
| Mean (SD) | 3420.66 (592.64) | 3408.76 (572.67) | |
| Missing | 238 | 375 | |
| Gestational age (weeks) | < 32 | 236 (1.4) | 628 (1.1) |
| 32-36 | 1252 (7.4) | 3776 (6.8) | |
| ≥ 37 | 15480 (91.2) | 50858 (92.0) | |
| Mean (SD) | 39.39 (2.45) | 39.52 (2.40) | |
| Missing | 704 | 2704 | |
| Plurality | Singleton | 17311 (98.0) | 56626 (97.7) |
| Multiple | 357 (2.0) | 1307 (2.3) | |
| Missing | 4 | 33 | |
| Birth order | First | 7186 (41.3) | 23131 (41.0) |
| Second | 5718 (32.9) | 18383 (32.6) | |
| Third | 2745 (15.8) | 9092 (16.1) | |
| Fourth | 1076 (6.2) | 3454 (6.1) | |
| Fifth or higher | 675 (3.9) | 2373 (4.2) | |
| Mean (SD) | 2.02 (1.23) | 2.04 (1.25) | |
| Missing | 272 | 1533 |
*
Years of education was not included as a continuous variable in NY from 1988-1990, since a larger number of missing data is present for the continuous variable, the categorical variable was used for comparison.