Table 1.

Demographics of Aus-CBT participants with genotyping and folate data

VariableCase, n (%)Control, n (%)
N child's genotype and covariates available321552
Child's age
 0–135 (10.9)62 (11.2)
 2–490 (28.0)158 (28.6)
 5–997 (30.2)179 (32.4)
 10–1599 (30.8)153 (27.7)
Child's sex
 Female132 (41.1)259 (46.9)
 Male189 (58.9)293 (53.1)
State of residence
 NSW/ACT111 (34.6)167 (30.3)
 Victoria/Tasmania93 (29.0)156 (28.3)
 SA/NT18 (5.6)39 (7.1)
 WA42 (13.1)66 (12.0)
 Queensland57 (17.8)124 (22.5)
Child's year of birth
 1990–199885 (26.5)132 (23.9)
 1998–2003136 (42.4)262 (47.5)
 2004–2010100 (31.2)158 (28.6)
Mother's age at child's birth
 <2548 (15.0)35 (6.3)
 25–34200 (62.3)341 (61.8)
 35+73 (22.7)176 (31.9)
Maternal education
 <Full high school78 (24.3)91 (16.5)
 Full high school/trade qualification110 (34.3)190 (34.4)
 University/college133 (41.4)271 (49.1)
Ethnic groupa
 European202 (62.9)429 (77.7)
 At least 50% European73 (22.7)85 (15.4)
 At least 50% non-European14 (4.4)17 (3.1)
 Indeterminate32 (10.0)21 (3.8)
Mean (SD)Mean (SD)
Child's age6.8 (4.4)6.5 (4.4)
Mother's age30.3 (5.2)32.0 (4.8)
Father's age33.3 (5.7)34.3 (5.5)

Abbreviations: ACT, Australian Capital Territory; NSW, New South Wales; NT, Northern Territory; SA, South Australia; WA, Western Australia.

  • aEuropean = at least 3 European grandparents; 50% European = 2 European grandparents; at least 50% non-European = 2 non-European grandparents and ethnicity of other 2 grandparents unknown; Indeterminate = no 2 grandparents with the same ethnicity (i.e., European or non-European) and 2+ grandparents of unknown ethnicity.