Table 2.

Summary of factor loadings for all clinical cases (N = 305).

	NeuroΨ symptoms	Neurological symptoms	Pain/fatigue symptoms	Viral-like symptoms
Slower speed of thinking	0.89
Trouble with memory	0.88
Trouble finding words or retrieving names	0.88
Feeling panicky, anxious or worried	0.82
Feeling irritable, sad, or decreased pleasure	0.81
Hot or cold sensations in extremities		0.70
Balance problems or sense of room-spinning		0.69
Bladder discomfort or change in urination		0.65
Numbness or tingling		0.64
Skin or muscle twitching		0.59
Change in visual clarity or trouble focusing		0.56
Light-headed or uncomfortable on standing		0.53
Irregular or rapid heart beats		0.53
Discomfort with normal light or sound		0.52
Shooting, stabbing or burning pains		0.50	0.43
Shortness of breath		0.45
Muscle aches or pains			0.92
Joint pain or swelling			0.87
Muscle weakness			0.75
Back pain			0.66
Feeling worse after normal physical exertion			0.58
Stiff or painful neck			0.58
Feeling fatigued or having low energy	0.40		0.51
Not feeling rested on awakening	0.44		0.46
Feeling feverish				0.99
Sweats and/or chills				0.85
Headaches				0.58
Nausea and/or vomiting				0.55

Loadings of <0.40 are not displayed.