Table 1.
Sociodemographic characteristics of subjects from the case-case analysis, California Childhood Leukemia Study (1995–2013)
| Characteristics | Total n = 670 n (%) |
Ras+ n = 122 n (%) [%]a |
Ras− n = 548 n (%) [%]a |
Test statistic | p |
|---|---|---|---|---|---|
| Race/ethnicity | χ2 = 6.89 | 0.03 | |||
| Latino | 339 (50.6) | 68 (55.7) [20.1] | 271 (49.5) [79.9] | ||
| Non-Latino white | 213 (31.8) | 27 (22.1) [12.7] | 186 (33.9) [87.3] | ||
| Non-Latino other | 118 (17.6) | 27 (22.1) [22.9] | 91 (16.6) [77.1] | ||
| Sex | χ2 = 0.23 | 0.64 | |||
| Male | 377 (56.3) | 71 (58.2) [18.8] | 306 (55.8) [81.2] | ||
| Female | 293 (43.7) | 51 (41.8) [17.4] | 242 (44.2) [82.6] | ||
| Annual household income (USD) | χ2 = 2.71 | 0.74 | |||
| <15,000 | 114 (17.0) | 19 (15.6) [16.7] | 95 (17.3) [83.3] | ||
| 15,000–29,999 | 129 (19.3) | 23 (18.9) [17.8] | 106 (19.3) [82.2] | ||
| 30,000–44,999 | 100 (14.9) | 23 (18.9) [23.0] | 77 (14.1) [77.0] | ||
| 45,000–59,999 | 104 (15.5) | 21 (17.2) [20.2] | 83 (15.1) [79.8] | ||
| 60,000–74,999 | 46 (6.9) | 8 (6.6) [17.4] | 38 (6.9) [82.6] | ||
| 75,000+ | 177 (26.4) | 28 (22.9) [15.8] | 149 (27.2) [84.2] | ||
| Child’s age at diagnosis, mean ± SD | 670 | 5.3 ± 3.1 | 5.7 ± 3.5 | t = 1.21 | 0.23 |
| Maternal age at birth, mean ± SDb | 666 | 28.2 ± 5.6 | 28.4 ± 6.3 | t = 0.37 | 0.71 |
| Paternal age, at birth mean ± SDb | 642 | 30.6 ± 6.5 | 31.0 ± 7.3 | t = 0.55 | 0.58 |
SD, standard deviation, Ras+, Ras positive, Ras−, Ras negative.
a
Numbers within square brackets refer to % of each category relative to total number of Ras + or Ras − cases.
b
Maternal and paternal age were missing 14 and 28 observations, respectively.