Figure 3.

Scatter gram of total FIQ scores and standard deviation of the NN intervals (SDNN) values evaluated during sleeping hours in 22 healthy controls. The linear association was evaluated by Pearson's correlation coefficient (r). FIQ, fibromyalgia impact questionnaire.

Lerma et al. Arthritis Research & Therapy 2011 13:R185   doi:10.1186/ar3513
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