Table 2.

Model summary: functional disability inventory.

Parameters	Fixed linear	Random linear	Fixed quadratic	Random quadratic	Covariates
Regression coefficients (fixed effects)
Intercept	16.74*	16.98*	16.35*	16.92*	18.62*
Time	−1.01*	−1.11*	−0.68†	−1.13	−1.11
Time2			0.06‡	0.01	0.01
Age					0.37
Insurance type					−0.76
Sex					−3.43
Variance components (random effects)
Residual	23.50*	15.83*	15.64*	11.31*	11.31*
Intercept	90.76*	120.92*	120.52*	123.43*	122.21*
Linear slope		1.77*	1.85*	20.83*	20.87*
Intercept/linear slope covariance		−7.20†	−7.22†	−21.07‡	−22.83†
Quadratic trend				0.28*	0.28*
Intercept/quadratic trend covariance				1.47	1.72
Linear slope/quadratic trend covariance				−2.33*	−2.33*
Model summary
Log likelihood	−1804.77	−1765.17	−1764.35	−1737.14	−1734.92
Number of estimated parameters	4	6	7	10	13

^*P < .01.

^†P < .05.

^‡P < .10.