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Table 1 Selected Characteristics of the Birth Cohort and Children with ASD and ID in Eight North Carolina Counties in 2002, 2004, 2006 and 2008

From: The spatial distribution of known predictors of autism spectrum disorders impacts geographic variability in prevalence in central North Carolina

Variable Birth Cohort n (%) All ASD n (%) ASD-ID n (%) ASD+ID n (%) All ID n (%)
Total 11809 (100.00) 561 (100.00) 330 (100.00) 231 (100.00) 1028 (100.00)
Sex      
Male 6073 (51.43) 464 (82.71) 279 (84.55) 185 (80.09) 665 (64.69)
Female 5736 (48.57) 97 (17.29) 51 (15.45) 46 (19.91) 363 (35.31)
Year of Birth      
1994 2727 (23.09) 87 (15.51) 49 (14.85) 38 (16.45) 224 (21.79)
1996 2825 (23.92) 119 (21.21) 66 (20.00) 53 (22.94) 266 (25.88)
1998 2958 (25.05) 151 (26.92) 86 (26.06) 65 (28.14) 254 (24.71)
2000 3299 (27.94) 204 (36.36) 129 (39.09) 75 (32.47) 284 (27.63)
Maternal Age at Birth      
Under 25 4984 (42.21) 184 (32.80) 89 (26.97) 95 (41.13) 460 (44.75)
25-35 5435 (46.02) 281 (50.09) 184 (55.76) 97 (41.99) 465 (45.23)
Over 35 1388 (11.75) 96 (17.11) 57 (17.27) 39 (16.88) 103 (10.02)
Missing 2 (0.02) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00)
Maternal Race      
White 8148 (69.00) 368 (65.6) 238 (72.12) 130 (56.28) 519 (50.49)
Other 3661 (31.00) 193 (34.4) 92 (27.88) 101 (43.72) 509 (49.51)
Maternal Educational Attainment      
Less than High School 2553 (21.62) 76 (13.55) 29 (8.79) 47 (20.35) 377 (36.67)
High School 3424 (29.00) 149 (26.56) 66 (20.00) 83 (35.93) 372 (36.19)
Some College 2472 (20.93) 126 (22.46) 77 (23.33) 49 (21.21) 144 (14.01)
College or More 3341 (28.29) 208 (37.08) 157 (47.58) 51 (22.08) 134 (13.04)
Missing 19 (0.16) 2 (0.36) 1 (0.30) 1 (0.43) 1 (0.10)
Maternal Tobacco Use During Pregnancy      
Yes 1647 (13.95) 67 (11.94) 38 (11.52) 29 (12.55) 208 (20.23)
No 10150 (85.95) 493 (87.88) 292 (88.48) 201 (87.01) 819 (79.67)
Missing 12 (0.10) 1 (0.18) 0 (0.00) 1 (0.43) 1 (0.10)
Plurality      
Yes 353 (2.99) 23 (4.10) 14 (4.24) 9 (3.90) 54 (5.25)
No 11456 (97.01) 538 (95.90) 316 (95.76) 222 (96.10) 974 (94.75)