Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Top 10 keywords in terms of frequency in the research.
| Ranking | Keyword | Frequency |
| 1 | Electroconvulsive therapy | 1,872 |
| 2 | Major depression | 851 |
| 3 | Efficacy | 397 |
| 4 | Disorder | 308 |
| 5 | Depression | 292 |
| 6 | Meta analysis | 259 |
| 7 | Treatment resistant depression | 238 |
| 8 | Double blind | 226 |
| 9 | Bipolar disorder | 141 |
| 10 | Electrode placement | 118 |
