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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)