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Table 3 Characteristics and variables to be extracted from included articles

From: Effects of transcutaneous electrical nerve stimulation (TENS) on proinflammatory cytokines: protocol for systematic review

Characteristics Variables
Population Age in years; sex; primary diagnosis; medical specialty; pain history
(parameters of TENS)
Frequency; intensity, pulse duration, modality, application area, duration of treatment; application interface; time of follow-up
Biochemical parameters Type of proinflammatory cytokines and evaluation of their expression in blood (level pre and post-intervention)
Methodological information Sample size, primary endpoint studied (inflammation), other outcomes, randomization, blinding, patient eligibility criteria.