How were the samples chosen?Only 101 out of more than 200 patient samples were choosen. How were they chosen?
All of the patients/samples used in the study were chosen randomly on the basis of a CFS diagnosis from more than 200 patient samples stored in the WPI repository since 2006. No one knew the status of the patients as all samples were blinded. None of the samples came from the original repository of samples owned by Dr. Peterson.
Study characteristic:Only 218 out of 320 control samples were choosen. How were they chosen?
- 67% women, reflecting gender incidence of CFS
- Mean age: 55
- 320 control samples from same geographic locations