Table 3.

Summary of factor loadings for EM and PTLDS (N = 218).

	Pain/fatigue symptoms	Neuropsychiatric symptoms	Neurological symptoms	Viral-like symptoms
Muscle aches or pains	0.92
Joint pain or swelling	0.76
Muscle weakness	0.76
Stiff or painful neck	0.65
Back pain	0.65
Feeling worse after normal physical exertion	0.6
Not feeling rested on awakening	0.56
Feeling fatigued or having low energy	0.54	0.43
Needing more sleep than usual	0.49
Trouble falling or staying asleep	0.48
Slower speed of thinking		0.85
Trouble with memory		0.84
Trouble finding words or retrieving names		0.84
Feeling panicky, anxious or worried		0.81
Feeling irritable, sad, or decreased pleasure		0.74
Hot or cold sensations in extremities			0.64
Skin or muscle twitching			0.63
Numbness or tingling			0.58
Bladder discomfort or change in urination			0.55
Balance problems or sense of room-spinning			0.54
Change in visual clarity or trouble focusing			0.51
Shortness of breath			0.5
Irregular or rapid heart beats			0.5
Shooting, stabbing or burning pains			0.45
Discomfort with normal light or sound			0.43
Feeling feverish				0.91
Sweats and/or chills				0.75
Headaches				0.54
Nausea and/or vomiting				0.5
Light-headed or uncomfortable on standing				0.43

Loadings of <0.40 are not displayed.