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Table 2 Birth year adjusted analyses of parental sociodemographic characteristics and childhood leukemia.

From: Parental and infant characteristics and childhood leukemia in Minnesota

  Sub-cohort ALL AML
  No. (%) No. (%) HR 95% CI No. (%) HR 95% CI
Maternal age (continuous/5 year increase) 8750 559 1.05 0.97–1.14 87 1.21 1.00–1.47
   missing 0 1    0   
Maternal Race        
   black 324 (4) 9 (2) 0.41 0.21–0.79 4 (5) 1.20 0.43–3.33
   other/unknown 519 (6) 30 (5) 0.87 0.60–1.28 6 (7) 1.16 0.50–2.68
   white 7907 (90) 520 (93) ref. 77 (89) ref.
   missing 0 (0) 1 (0)    0 (0)   
Maternal birthplace        
   U.S. or U.S. territory 8226 (94) 532 (95) ref. 76 (87) ref.
   foreign born 516 (6) 26 (5) 0.76 0.51–1.15 11 (13) 2.18 1.14–4.18
   missing 8 (0) 2 (0)    0 (0)   
Maternal Education        
   high school 3173 (38) 179 (34) ref. 29 (36) ref.
   <high school 902 (11) 49 (9) 0.96 0.69–1.33 8 (10) 0.97 0.44–2.14
   >high school 4209 (51) 301 (57) 1.21 1.00–1.47 44 (54) 1.13 0.70–1.81
   missing 466 (5) 31 (6)    6 (7)   
Marital status        
   married 6988 (80) 459 (82) ref. 75 (86) ref.
   not married 1754 (20) 100 (18) 0.84 0.67–1.05 12 (14) 0.61 0.33–1.13
   missing 8 (0) 1 (0)    0 (0)