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Table 3 Corrected item to total correlations for the CDC Symptom Inventory DLV Total score, the Symptom Inventory Short Form score and the Symptom Inventory Case Definition score.

From: Translation and validation of the Dutch language version of the CDC Symptom Inventory for assessment of Chronic Fatigue Syndrome (CFS)

Symptom Corrected item total correlations
  Total Score Short Form Case Definition
  Female Male Female Male Female Male
Sore throat .40 .28    .34 .30
Tender nodes .42 .24    .37 .22
Diarrhea .40 .47     
Unusual fatigue after exertion .66 .82 .69 .86 .61 .84
Muscle aches .48 .63 .44 .57 .59 .67
Joint pain .38 .50    .43 .52
Feverishness .35 .27     
Chills .36 .60     
Unrefreshing sleep .69 .83 .75 .87 .61 .82
Sleeping problems .64 .72 .66 .78   
Headaches .36 .64    .41 .62
Memory problems .56 .66 .56 .64   
Concentration .66 .86 .68 .89 .57 .78
Nausea .49 .42     
Stomach pain .45 .47     
Sinus problems .27 .40     
Shortness of breath .38 .41     
Sensitivity to light .40 .60     
Depression .41 .56