Skip to main content
letter
. 2009 Jul 14;101(3):518–521. doi: 10.1038/sj.bjc.6605169

Table 2. Infant and parental sociodemographic characteristics of cases and controls.

Characteristics No. of cases (%) No. of controls (%) P-value
Gestational age category (weeks)      
 <37 35 (12.6) 44 (10.4)  
 37–42 236 (84.9) 367 (86.8)  
 >42 7 (2.5) 12 (2.8) 0.37
 Mean (s.d.) 39.5 (5.6) 39.6 (4.6) 0.76
       
Birth weight (grams)      
 2501–4000 214 (77.0) 351 (83.0)  
 ⩽2500 22 (7.9) 26 (6.1)  
 >4000 42 (15.1) 46 (10.9) 0.05
 Mean (s.d.) 3354 (681) 3373.7 (590) 0.69
       
Maternal age category (years)      
 ⩽24 90 (32.4) 128 (30.3)  
 25–29 99 (35.6) 145 (34.3)  
 30–34 60 (21.6) 111 (26.2)  
 ⩾35 29 (10.4) 39 (9.2) 0.56
 Mean (s.d.) 27.2 (5.5) 27.3 (5.4) 0.66
       
Maternal education      
 Less than high school 28 (10.1) 23 (5.4)  
 High school graduate 110 (39.7) 143 (33.9)  
 College, no degree 53 (19.1) 97 (23.0)  
 College degree and/or graduate school 86 (31.1) 159 (37.7) 0.004
       
Maternal race      
 White 213 (76.9) 356 (84.4)  
 Black 25 (9.0) 25 (5.9)  
 Hispanic 27 (9.8) 23 (5.4)  
 Other 12 (4.3) 18 (4.3) 0.05
       
Household income (US dollars)      
 <20 000 85 (31.0) 83 (19.9)  
 20 000–30 000 60 (21.9) 109 (26.1)  
 30 001–50 000 63 (23.0) 124 (29.7)  
 >50 000 66 (24.1) 102 (24.4) 0.03