Table 2.

Comparison of parameter estimates under alternative models for the within-subject association

Effect	Model	Estimate	SE	Z-statistic	P-value
Intercept	Bridge	1.827	1.459	1.25	0.211
	AR(1)-corr	1.374	1.590	0.86	0.388
	AR(1)-τ	1.389	1.514	0.92	0.359
	Heagerty	2.073	1.407	1.47	0.141
	Bahadur	1.763	1.352	1.30	0.193
	GEE	1.959	1.506	1.30	0.193
Time	Bridge	−0.641	0.080	−8.02	< 0.001
	AR(1)-corr	−0.812	0.102	−7.98	< 0.001
	AR(1)-τ	−0.815	0.094	−8.67	< 0.001
	Heagerty	−0.612	0.063	−9.64	< 0.001
	Bahadur	−0.637	0.088	−7.28	< 0.001
	GEE	−0.642	0.098	−6.57	< 0.001
HIV	Bridge	−0.075	0.266	−0.28	0.777
	AR(1)-corr	−0.082	0.264	−0.31	0.756
	AR(1)-τ	−0.076	0.259	−0.29	0.769
	Heagerty	−0.038	0.249	−0.15	0.879
	Bahadur	−0.037	0.269	−0.14	0.891
	GEE	−0.073	0.264	−0.28	0.782
TIME*HIV	Bridge	0.234	0.135	1.73	0.084
	AR(1)-corr	0.336	0.170	1.97	0.049
	AR(1)-τ	0.323	0.160	2.02	0.044
	Heagerty	0.226	0.101	2.23	0.025
	Bahadur	0.213	0.140	1.53	0.128
	GEE	0.251	0.156	1.61	0.108
MOM SMOKE	Bridge	−0.182	0.176	−1.03	0.303
	AR(1)-corr	−0.170	0.185	−0.92	0.359
	AR(1)-τ	−0.179	0.177	−1.01	0.314
	Heagerty	−0.197	0.187	−1.05	0.292
	Bahadur	−0.206	0.172	−1.20	0.231
	GEE	−0.200	0.173	−1.15	0.248
GEST AGE	Bridge	−0.045	0.037	−1.22	0.225
	AR(1)-corr	−0.038	0.040	−0.93	0.352
	AR(1)-τ	−0.037	0.038	−0.95	0.341
	Heagerty	−0.052	0.036	−1.45	0.149
	Bahadur	−0.043	0.034	−1.26	0.207
	GEE	−0.048	0.038	−1.26	0.207
Low Birth Wt	Bridge	0.086	0.190	0.45	0.652
	AR(1)-corr	0.122	0.198	0.62	0.536
	AR(1)-τ	0.136	0.191	0.71	0.477
	Heagerty	0.078	0.191	0.41	0.683
	Bahadur	0.096	0.173	0.55	0.581
	GEE	0.083	0.193	0.43	0.667
Parameter	Model	Estimate	95% Confidence Interval
φ	Bridge	0.847	[0.788,0.906]
	AR(1)-corr	0.686	[0.556,0.815]
	AR(1)-τ	0.731	[0.634,0.827]
ρ	AR(1)-corr	0.841	[0.725,0.957]
τ	AR(1)-τ	0.749	[0.651,0.847]
Γ	Bahadur AR(1)	0.206	[0.107,0.304]