Table II.

Trajectory Estimation and Group Membership among a sample of YGBMSM (N=94) participating in a 12-week rectal placebo gel trial

	Model 1			Model 2
	Single Trajectory Analysis			Trajectory 1 (High & Varying Use)			Trajectory 2 (Low & Consistent Use)
	b(SE)	t	p	b(SE)	t	p	b(SE)	t	p
Intercept	.50(.07)	7.01	.0001	1.12(.09)	12.40	.0001	−.36(.14)	−2.41	.02
Linear	−.27(.07)	−4.09	.0001	−.40(.08)	−5.02	.0001	.10(.13)	.73	.47
Quadratic	.05(.01)	3.61	.001	.09(.02)	5.05	.0001	−.05(.03)	−1.72	.09
Cubic	−.003(.001)	−3.57	.001	−.006(.001)	−5.12	.0001	.004(.002)	1.90	.05
Probability of Membership
N=94 (100%)				N=38 (40.3%)			N=56 (59.7%)
Model Fit Statistics
BIC	−1833.45 (N=94)				−1595.42 (N=94)
AIC	−1828.37					−1583.98

Notes. BIC = Bayesian Information Criterion; AIC = Akaike Information Criterion