Table 2.

Group-based trajectory model for postsurgical pain trajectories

Trajectory group	Probability of group membership	Standard error	Parameter	Estimate	Standard error
1	78.0	10.5	Intercept	5.53	0.84
			Linear	−1.69	0.82
			Quadratic	0.06	0.17
2	22.0	10.5	Intercept	3.73	1.90
			Linear	1.79	1.78
			Quadratic	−0.54	0.34