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. Author manuscript; available in PMC: 2026 Jan 6.
Published in final edited form as: Biostatistics. 2024 Dec 31;26(1):kxaf039. doi: 10.1093/biostatistics/kxaf039

Table 3:

Parameter estimates of marginal mean, dispersion, and correlation parameters (and standard errors in parentheses) from the overall analysis of Washington State EPT Trial using networkGEE. βk is the period k fixed effect.

1. Ind 2. SimpExch 3. NestExch 4. Ind + Covariates 5. SimpExch + Covariates 6. NestExch + Covariates
Marginal mean
δ −0.109
(0.076)		 −0.128
(0.066)		 −0.106
(0.055)		 −0.079
(0.074)		 −0.118
(0.060)		 −0.102
(0.055)
β1 −2.182
(0.083)		 −2.205
(0.086)		 −2.142
(0.082)		 −2.398
(0.082)		 −2.444
(0.086)		 −2.410
(0.088)
β2 −2.307
(0.058)		 −2.317
(0.064)		 −2.230
(0.067)		 −2.498
(0.062)		 −2.523
(0.070)		 −2.480
(0.078)
β3 −2.411
(0.058)		 −2.420
(0.072)		 −2.308
(0.069)		 −2.553
(0.058)		 −2.573
(0.076)		 −2.529
(0.084)
β4 −2.504
(0.079)		 −2.513
(0.078)		 −2.403
(0.073)		 −2.660
(0.079)		 −2.678
(0.083)		 −2.634
(0.083)
β5 −2.504
(0.095)		 −2.503
(0.105)		 −2.374
(0.099)		 −2.632
(0.095)		 −2.632
(0.109)		 −2.577
(0.112)
γMale — — — 0.699
(0.100)		 0.733
(0.090)		 0.695
(0.084)
γAge — — — −0.028
(0.010)		 −0.032
(0.010)		 −0.037
(0.009)
Correlation
ρ1 — 0.0016
(0.0007)		 0.0054
(0.0016)		 — 0.0020
(0.0008)		 0.0037
(0.0011)
ρ2 — — −0.0003
(0.0008)		 — — 0.0005
(0.0009)
Fitting time (seconds) 0.08 0.23 0.29 0.09 0.30 0.45