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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: Compr Psychiatry. 2016 Jan 22;66:104–112. doi: 10.1016/j.comppsych.2016.01.010

Table 2.

Between-Day GEE Models for Binge Eating and Purging Frequency.

Variables b (SE) Wald χ2 p
Binge Eating Frequency
Intercept −2.05 (0.23) 80.45 <.001
Negative Affect 0.13 (0.02) 35.12 <.001
Negative Urgency 0.61 (0.37) 2.74 .10
Negative Affect × Negative Urgency −0.08 (0.03) 8.28 .004
Covariate Effects
Study Day −0.03 (0.02) 2.55 .11
Study Day × Negative Affect 0.004 (0.004) 0.77 .38
Study Day × Negative Urgency 0.02 (0.04) 0.28 .60
Purging Frequency
Intercept −1.40 (0.26) 28.80 <.001
Negative Affect 0.08 (0.03) 14.69 <.001
Negative Urgency 0.80 (0.42) 3.63 .06
Negative Affect × Negative Urgency −0.04 (0.02) 4.09 .04
Covariate Effects
Study Day −0.02 (0.01) 10.74 .001
Study Day × Negative Affect 0.004 (0.005) 0.70 .40
Study Day × Negative Urgency −0.02 (0.01) 2.13 .14

Note: “Study Day” was modeled via main and interaction effects to ensure that the Negative Affect × Negative Urgency interaction term was properly adjusted for by the potentially confounding effects of this covariate. Degrees of freedom for Wald χ2 = 1.