Table 2.
Year | SR children | General population | Pvalue derived from Mann-Whitney test | ||
---|---|---|---|---|---|
n | Mean (standard deviation) age at childbirth | n | Mean (standard deviation) age at childbirth | ||
2000 | 134 | 27.69 (3.33)a | 1181803 | 26.29 (4.12)c | 1.63e-07 |
2010 | 64 | 29.78 (3.71)b | 1157270 | 27.68 (5.98)d | 5.93e-06 |
aMaternal age at birth of 134 children of the SR with a parent-reported diagnosis of ASD or ‘autistic tendencies’ born between 1 November 1999 and 31 October 2000.
bMaternal age at birth of 64 children of the SR with a parent-reported diagnosis of ASD or ‘autistic tendencies’ born between 1 November 2009 and 31 October 2010.
cMaternal age at birth of 1,181,803 children between 1 November 1999 and 31 October 2000 from China’s 2000 census data.
dMaternal age at birth of 1,157,270 children between 1 November 2009 and 31 October 2010 from China’s 2010 census data.