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Table 1 Characteristics of study sample (n = 94) by diagnostic status in the CHARGE Study, California, 2003 - 2005

From: Polybrominated diphenyl ethers in relation to autism and developmental delay: a case-control study

  AU/ASD DD N = 24 TD n = 21   
Characteristic: Categorical variables: Weighted (unweighted) %† Weighted (unweighted) %† Weighted (unweighted) %† AU/ASD vs. TD p-value† DD vs. TD p-value†
Child's sex, male 92 (88) 68 (63) 86 (86) 0.81 0.19
Child's race/ethnicity      
   White 30 (43) 18 (29) 32 (43) 0.94 0.56
   Hispanic 45 (43) 60 (50) 48 (43)   
   Other 25 (14) 22 (21) 20 (14)   
Mother's education      
   ≤ High school 12 (10) 44 (33) 36 (28) 0.03 0.10
   Some college 60 (51) 45 (46) 26 (24)   
   College or higher degree 28 (39) 11 (21) 38 (48)   
Computers in household      
   None 13 (9) 37 (29) 24 (20) 0.61 0.35
   One 52 (52) 24 (25) 47 (50)   
   Two or more 35 (39) 39 (46) 29 (30)   
New car purchased in the first 2 years of child's life 21 (22) 24 (30) 10 (10) 0.29 0.24
Private insurance provider‡ 72 (80) 50 (67) 74 (86) 0.88 0.17
Regional Center catchment area‡      
   Alta, Far Northern, Redwood Coast 28 (31) 51 (54) 29 (29) 0.46 0.63
   North Bay 20 (23) 5 (4) 11 (14)   
   East Bay, San Andreas, Golden Gate 16 (10) 7 (8) 5 (10)   
   Valley Mountain, Central Valley, Kern 18 (18) 17 (13) 34 (33)   
   LA RCs*, Orange, San Diego, Tri-counties, Inland, San Gabriel/Pomona 18 (18) 20 (21) 21 (14)   
Child ate ocean fish (incl. tuna, caught) prior to age 2 yrs 27 (27) 39 (37) 39 (43) 0.37 0.99
Child ate freshwater fish (incl. caught) prior to age 2 yrs 8 (7) 7 (8) 8 (9) 0.99 0.85
Child's age, yrs 3.7 (0.1) 3.7 (0.2) 3.7 (0.1) 0.99 0.99
Child's weight, kg 17.1 (0.6) 15.4 (0.9) 16.9 (0.8) 0.85 0.23
Child's height, cm 99.5 (1.4) 96.4 (1.9) 99.2 (1.6) 0.90 0.26
Child's weight-to-height ratio, kg/m 16.9 (0.4) 15.8 (0.7) 16.9 (0.6) 0.92 0.25
Child's body mass index (BMI) 16.9 (0.2) 16.3 (0.6) 17.0 (0.5) 0.87 0.39
Length of breastfeeding, months 5.7 (0.6) 6.1 (1.7) 6.2 (1.9) 0.81 0.98
Mother's age, yr‡ 30.4 (0.8) 28.3 (1.5) 27.7 (1.4) 0.10 0.79
Father's age, yr‡ 32.5 (1.0) 30.7 (2.3) 30.4 (1.5) 0.25 0.92
Calendar years from first participant blood draw 1.0 (0.1) 1.2 (0.1) 1.4 (0.1) 0.006 0.34
  1. †The weights were calculated to reflect the population targeted for recruitment. For children with AU/ASD or DD, this population was identified from the California DDS records for those who met our geographic and age criteria during the recruitment period. For children in the TD group, they were identified from State Birth Files, after restricting to those who met our geographic and age criteria during the recruitment period. The p-values were from comparisons of weighted proportions.
  2. ‡At the time of the child's birth.
  3. *Los Angeles Regional Centers include Lanterman, Harbor, Westside, and Eastern, South Central, and North Los Angles