Table 1.
Characteristics of selected articles.
| Characteristic | Category | Number | Percent |
|---|---|---|---|
| Total number of papers | 47,090 | 100.0 | |
| Year of publication | |||
| 1916–1979 | 500 | 1.1 | |
| 1980–1989 | 1113 | 2.4 | |
| 1990–1999 | 7066 | 15.0 | |
| 2000–2009 | 13,464 | 28.6 | |
| 2010–2018 | 24,947 | 53.0 | |
| Number of authors | |||
| 1 | 8398 | 17.8 | |
| 2–3 | 18,520 | 39.3 | |
| 4–6 | 14,787 | 31.4 | |
| 7–10 | 4265 | 9.1 | |
| >10 | 1120 | 2.4 | |
| Number of subject categories | |||
| 1 | 23,869 | 50.7 | |
| 2 | 15,077 | 32.0 | |
| 3 | 7484 | 15.9 | |
| 4 | 563 | 1.2 | |
| >5 | 97 | 0.2 | |
| Main subject categories | |||
| Psychology | 16,049 | 34.1 | |
| Family studies | 8225 | 17.5 | |
| Social work | 7367 | 15.6 | |
| Psychiatry | 6365 | 13.5 | |
| Pediatrics | 4938 | 10.5 | |
| Others | 4146 | 8.8 | |
| Country of the first author (top 10) | |||
| United States | 26,371 | 56.0 | |
| England | 4675 | 9.9 | |
| Canada | 3282 | 7.0 | |
| Australia | 2664 | 5.7 | |
| Netherlands | 1244 | 2.6 | |
| Germany | 1188 | 2.5 | |
| Sweden | 1002 | 2.1 | |
| South Africa | 911 | 1.9 | |
| Israel | 860 | 1.8 | |
| The People’s Republic of China | 755 | 1.6 |