TABLE 4.

Trajectory Parameter Estimates by Class for Each Symptom Model

Symptom/class	(%)a	Mean intercept	Mean slopeb	Interpretation
Chest discomfort
Class 1	(20.4)	2.34**	0.20*	Mild/persistent
Class 2	(69.4)	2.26**	−0.36**	Tapering off
Class 3	(10.2)	4.49**	0.45**	Moderate/worsening
Chest pain
Class 1	(84.8)	2.02**	−0.28**	Tapering off
Class 2	(15.2)	3.67**	0.51**	Moderate/worsening
Chest pressure
Class 1	(80.0)	2.00**	−0.28**	Tapering off
Class 2	(20.0)	2.95**	0.50**	Moderate/worsening
Lightheadedness
Class 1	(78.2)	0.89**	0.18**	Mild/persistent
Class 2	(21.8)	6.58**	−0.76**	Moderate/improving
Shortness of breathc
Class 1	(17.4)	8.19**	−0.91**	Severe/improving
Class 2	(21.6)	4.36**	−0.36**	Moderate/persistent
Class 3	(61.0)	0.29**	0.33**	Late onset/worsening
Shoulder paind
Class 1	(11.8)	2.96**	−0.07**	Mild/persistent
Class 2	(11.1)	5.90**	−0.49**	Moderate/persistent
Class 3	(7.7)	8.57**	−1.04**	Severe/improving
Class 4	(69.3)	0.06**	0.39**	Late-onset/worsening
Unusual fatigue
Class 1	(65.4)	2.75**	−0.45**	Tapering off
Class 2	(17.9)	4.29**	0.62**	Moderate/worsening
Class 3	(16.7)	2.40**	0.33**	Mild/persistent
Upper back pain
Class 1	(66.8)	0.07**	0.34**	Late onset/worsening
Class 2	(11.8)	5.96**	−0.74**	Moderate/improving
Class 3	(14.1)	2.97**	−0.21*	Mild/persistent
Class 4	(7.4)	8.75**	−1.06**	Severe/improving

^aPercentage of sample in each class.

^bChange in symptom severity/month.

^cIntercept variances were: 2.90 (Class 1), 3.29 (Class 2), and 0.70 (Class 3).

^dIntercept variances were: 0.67 (Class 1), 0.88 (Class 2), 1.23 (Class 3), and 0.07 (Class 4).

^*p < .05.

^**p < .001.