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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: J Child Psychol Psychiatry. 2017 Aug 12;59(3):213–222. doi: 10.1111/jcpp.12775

Table 2.

Two logistic models of the relationship between parental history of ADHD and family income

Model 11 N 953 Adjusted OR2 95% C.I. P Model 2 N 953 Adjusted OR 95% C.I. P
With parental history of ADHD diagnosis With parental history of ADHD symptoms
 Low family income3 59 16.7 7.8–35.5 .0164  Low family income 115 21.6 11.0–42.5 .082
 Moderate family income 112 10.2 5.4–19.1  Moderate family income 202 12.0 6.8–21.4
 High family income 66 12.0 5.7–24.9  High family income 121 8.3 4.4–15.6
Without Parental history of ADHD diagnosis Without Parental history of ADHD symptoms
 Low family income 160 6.2 3.4–11.3  Low family income 104 7.5 3.7–15.4
 Moderate family income 330 2.3 1.5–3.7  Moderate family income 240 2.6 1.5–4.5
 High family income 226 1.0 -  High family income 171 1.0
​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Race ethnicity Race ethnicity
 Non-White 212 0.78 0.5–1.2 0.30  Non-White 212 0.75 0.5–1.2 0.25
 White 741 1.0 -  White 741 1.0
Gender Gender
 Male 603 5.8 4.0–8.5 <.001  Male 603 5.7 3.9–8.2 <.001
 Female 350 1.0 -  Female 350 1.0
Age group Age group
 Age 11–14 208 1.1 0.7–1.8 0.59  Age 11–14 208 1.2 0.8–2.0 0.41
 Age 9–10 382 1.4 1.0–2.1 .06  Age 9–10 382 1.6 1.1–2.4 .015
 Age 6–8 363 1.0 1.0  Age 6–8 363 1.0
1

Both Model 1 and Model 2 include family income, parental history, race/ethnicity, gender and age. The only difference in the two models is how parental history was defined.

2

The group with the Odds Ratio of 1.0 is the comparison group in each case. For the interaction model which combines parental history and family income, the comparison group is high family income without a parental history of ADHD.

3

Family income was defined as low if <$20,000 per year, medium $20–49,999 per year, and high >$50,000 per year

4

P values for interactions (P=.016 and P=.08) are for a 2 degree-of-freedom adjusted Wald test comparing a model with a multiplicative interaction term for family income and parental history of ADHD with a main effects model. The remaining P values in the table are based on the main effects of the other covariates.