Table 4.

Combinations of studies with similar study designs.

Authors	Sample size	Days treated	Stimulation frequency (Hz)	Stimulation intensity (% RMT)	Daily pulses	Findings for the RMT
Shajahan et al., 2002	15	10	5, 10, 20	80	500	↑
Chistyakov et al., 2005	18	10	10	100	500	↑
Pretalli et al., 2012	75	10	10	95	1200	↔
Dolberg et al., 2002	46	20	10	90	1200	↔
Bajbouj et al., 2005	30	10	20	100	2000	↔
Triggs et al., 1999	9	10	20	80	2000	↓
Zarkowski et al., 2009	50	15	10	120	3000	↔
Croarkin et al., 2012	7	25	10	120	3000	↓
Spampinato et al., 2013	12	20	10	120	3000	↔

All studies stimulated the left dorsolateral prefrontal cortex in only patients with affective disorders. Variable of interest was the resting motor threshold.

RMT, resting motor threshold; ↑, increases; ↔, no changes; ↓, decreases in RMT over the course of the repetitive transcranial magnetic stimulation.