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Table 2 Principal characteristics of childhood acute leukemia cases and controls age between 2 and 20 years

From: Cured meat, vegetables, and bean-curd foods in relation to childhood acute leukemia risk: A population based case-control study

  ALL AML
Variablea Case (n = 112) Control (n = 279) Case (n = 33) Control (n = 91)
Age (years) (median (SD)) 6.9 (5.6) 7.8 (5.5) 14.6 (4.9) 14.8 (4.9)
Sex     
   Male (%) 76 (67.9) 185 (66.3) 18 (54.5) 53 (58.2)
   Female (%) 36 (32.1) 94 (33.7) 15 (45.5) 38 (41.8)
Maternal age (years)     
   < 25 (%) 27 (24.5) 73 (26.3) 6 (18.2) 21 (23.1)
   25–34 (%) 74 (67.3) 185 (66.5) 27 (81.8) 68 (74.7)
    35 (%) 9 (8.2) 20 (7.2) 0 (0.0) 2 (2.2)
Birth weight (g)     
   < 3000 (%) 27 (24.1) 72 (25.8) 11 (33.3) 25 (27.5)
   3000–3499 (%) 48 (42.9) 134 (48.0) 10 (30.3) 42 (46.2)
    3500 (%) 37 (33.0) 73 (26.2) 12 (36.4) 24 (26.4)
Breastfeeding     
   Never (%) 70 (62.5) 157 (56.3) 25 (75.8) 59 (64.8)
   Ever (%) 41 (36.6) 121 (43.3) 8 (24.2) 32 (35.2)
   Unknown (%) 1 (0.9) 1 (0.4) 0 (0.00) 0 (0.0)
Maternal smoking during pregnancy     
   Yes (%) 1 (0.9) 4 (1.4) 1 (3.0) 0 (0.0)
   No (%) 111 (99.1) 275 (98.6) 32 (97.0) 91 (100.0)
Paternal smoking during pregnancy     
   Yes (%) 59 (53.6) 152 (54.5) 20 (60.6) 55 (50.4)
   No (%) 51 (46.4) 127 (45.5) 13 (39.4) 36 (39.6)
Subjects smoking before diagnosis     
   Yes (%) 1 (0.9) 6 (2.2) 0 (0) 1 (1.1)
   No (%) 111 (99.1) 273 (97.8) 33 (100) 90 (98.9)
Parental education levels b     
   Not junior high school graduated (%) 5 (4.5) 15 (5.4) 0 (0.00) 10 (11.0)
   Junior high school graduated (%) 9 (8.0) 35 (12.5) 7 (21.2) 13 (14.3)
   High school graduated (%) 55 (49.1) 114 (40.9) 13 (39.4) 41 (45.1)
   Four-year college/university and above (%) 43 (38.4) 115 (41.2) 13 (39.4) 27 (29.7)
  1. aNumber and percent of group (%) or (median(SD)). Percents are rounded
  2. bHighest education level of either parent