Table 2.

Characteristics of the 20-Item Symptom Index (Original and Rescaled)

		Rescaled†
Variables	Number of Observations	Mean	Std. Deviation
energy	5521	47.70	35.93
fevers	5521	20.43	29.81
dizziness	5521	23.20	30.69
tingling	5521	30.80	35.49
remembering	5521	30.95	33.79
nausea	5521	16.99	28.15
diarrhea	5521	32.09	34.48
depression	5521	41.50	34.61
anxiety	5521	38.77	34.92
insomnia	5521	41.20	37.60
itching	5521	31.25	35.10
coughing	5521	20.77	30.39
headaches	5521	25.37	32.13
appetite loss	5521	19.96	30.93
bloating	5521	30.53	34.55
muscle ache	5521	33.99	36.15
sexual problems	5521	35.87	37.74
weight gain	5521	33.34	37.57
weight loss	5521	20.01	32.41
hair loss	5521	16.17	28.32

^†Original scaling was recoded as follows:

0=”I do not have symptoms” to “0”(Best Health, No Symptom Distress);

1= “Have symptom, it doesn’t bother me” to “25”;

2= “Have symptom, it bothers me a little” to “50”;

3= “Have symptom, it bothers me” to “75”, and

4= “Have symptom, it bothers me a lot” to “100” (Worst Health, Greatest Symptom Distress)