Table 1.
Child, parent and family factors by age of autism diagnosis
| Categorical variables | Diagnosis by age 7 | Diagnosis between 8 and 14 | |||
|---|---|---|---|---|---|
| Freq. | % | Freq. | % | F a | |
| Female child | 19 | 11.70 | 76 | 27.70 | 9.66** |
| Child has white ethnicity | 127 | 89.19 | 256 | 92.79 | 1.58 |
| ADHD diagnosis | |||||
| No diagnosis | 101 | 72.50 | 191 | 69.63 | 5.380** |
| Late diagnosis | 16 | 9.35 | 63 | 21.13 | |
| Early diagnosis | 29 | 18.15 | 30 | 0.24 | |
| Mother has university degree (by age 14) | 25 | 15.62 | 54 | 22.75 | 0.14 |
| Continuous variables | n (valid) | Mean (SE) | n (valid) | Mean (SE) | t b |
|---|---|---|---|---|---|
| Family socioeconomic disadvantage (age 5) | 143 | 0.24 (0.03) | 276 | 0.25 (0.02) | −0.14 |
| Mother’s age at birth of child | 146 | 28.61 (0.49) | 280 | 27.83 (0.42) | 0.65 |
| Child general cognitive ability (age 5) | 99 | 91.92 (1.96) | 262 | 95.67 (1.10) | −2.82**** |
Ns are unweighted.
a
F statistic for design‐based Pearson chi‐square that is converted to F test to account for the MCS sampling design.
b
t‐test statistic.
**
p < .01; ***p < .001. Means and percentages are weighted.