Table.
Results of Medline search for 12 active verbs in titles of clinical trials and other papers. Verbs grouped as absolute, relative, or nounal (see text for details)
| Year of publication | Total No of papers | No (%) of papers that are clinical trials | No (%) of clinical trials with active verb in title
|
No (%) of non-clinical trials with active verb in title | |||
|---|---|---|---|---|---|---|---|
| Absolute verb | Relative verb | Nounal verb | All verbs | ||||
| 1970 | 216 457 | 2 033 (0.94) | 0 | 0 | 0 | 0.00 | 311 (0.15) |
| 1975 | 265 040 | 3 701 (1.40) | 0 | 1 (0.03) | 0 | 1 (0.03) | 410 (0.16) |
| 1980 | 308 314 | 4 251 (1.38) | 0 | 3 (0.07) | 5 (0.12) | 8 (0.19) | 771 (0.25) |
| 1985 | 318 473 | 6 740 (2.12) | 3 (0.04) | 22 (0.33) | 11 (0.16) | 36 (0.53) | 1173 (0.38) |
| 1990 | 399 121 | 11 983 (3.00) | 18 (0.15) | 56 (0.47) | 42 (0.35) | 116 (0.97) | 2188 (0.57) |
| 1995 | 427 616 | 20 632 (4.82) | 23 (0.11) | 172 (0.83) | 116 (0.56) | 311 (1.51) | 3153 (0.77) |
| 1997 | 426 014 | 20 381 (4.78) | 26 (0.13) | 225 (1.10) | 125 (0.61) | 376 (1.84) | 3645 (0.90) |