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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Intelligence. 2018 Mar 16;68:58–65. doi: 10.1016/j.intell.2018.03.003

Table 7.

Full GEE Model Predicting ELC Scores

Parameter Estimate Standard Error P-Value
Intercept 200.56 27.25 1.80E-13
Year 2 −71.97 35.60 0.04
Sex (Male) −2.21 1.18 0.06
Gest Number (Twin) −1.79 2.09 0.39
Gestational Age at Birth −0.08 0.05 0.09
Paternal Education in Years −0.53 0.19 7.01E-03
Age in Days −0.16 0.05 1.02E-03
Months Since Start of 1yr MSEL Testing 0.15 0.02 6.50E-12
Year 2*Gest Number (Twin) −9.26 2.46 1.60E-04
Year 2*Paternal Education in Years 1.61 0.25 1.20E-10
Year 2*Age in Days 0.14 0.06 0.02
Year 2*Months Since Start of 2yr MSEL Testing −0.05 0.03 0.12

Note: Because the reference group for year (i.e. year 1 or year 2) is year 1, the coefficients for effects of year 2 are calculated by adding the coefficients for the single term (i.e. Gestation Number (Twin)) plus the coefficient for the interaction term (i.e. Year 2 * Gest Number (Twin)).