Salvino 2013.

Methods	Type of study: randomised, placebo controlled. Condition and number of participants randomised: 145 consecutive headache sufferers grouped in 2 groups according to cutaneous allodynia total score. Groups: real or sham TENS.
Participants	Demographics: information not available. Setting: information not available. Inclusion: information not available. Exclusion: information not available. Withdrawals/dropouts: information not available.
Interventions	TENS group Where applied: at the back of the head bilaterally. Applied by: information not available. Waveform: information not available. Frequency: information not available. Pulse duration: information not available. Pulse amplitude/Intensity: information not available. Electrodes: information not available. Duration and frequency of Rx: 30 minutes, three times a day for two consecutive weeks. Device/manufacturer: information not available. Adverse effects: information not available. Sham TENS group: information not available.
Outcomes	Pain outcome: number of headache free‐days (> 50%) at 15, 30 and 60 days. ITT/per protocol analysis: information not available. Statistical analysis: information not available. "A significant change in number of headache free‐days above 50% was observed in 53 (49%) out of l08 patients treated with real TENS. Of these patients thirty‐seven respondents (82%) were non allodynic. While 47 (75%) out of the 63 non respondents were allodynic patients. Only 2 (5%) out of the 37 patients were responsive to sham TENS therapy."
Notes	Objectives: to test if cutaneous allodynia influences the response to treatment with TENS in headache sufferers.