Table 2.
Distribution of the four explanatory factors among the 187 models analysed
| Factors of article classification | Classes | n (%) | Mean no. of parameters per model (SD) | Kruskal–Wallis rank sum test |
|---|---|---|---|---|
| Year of publication | 1976–1985 | 10 (5.3) | 12.4 (2.4) | χ2 = 1.257 d.f. = 4 P = 0.869 |
| 1986–1990 | 29 (15.5) | 13.3 (2.8) | ||
| 1991–1995 | 27 (14.4) | 13.5 (3.0) | ||
| 1996–2000 | 51 (27.3) | 13.4 (3.2) | ||
| 2000–2006 | 70 (37.4) | 13.1 (3.1) | ||
| Citation group | Ecologists and agronomists | 44 (23.5) | 13.7 (3.0) | χ2 = 17.588 d.f. = 2 P < 0.001 |
| Medical scientists | 138 (73.8) | 11.9 (2.3) | ||
| Isolated | 5 (2.7) | 10.4 (3.8) | ||
| Pesticide or drug | Insecticidal protein | 39 (20.9) | 14.8 (3.0) | χ2 = 33.138 d.f. = 7 P < 0.001 |
| Insecticide | 30 (16) | 14.4 (2.4) | ||
| Antibiotic drug | 29 (15.5) | 11.5 (2.8) | ||
| Others | 25 (13.3) | 13.7 (2.4) | ||
| Herbicide | 18 (9.6) | 13.6 (3.2) | ||
| Unspecific pesticide | 17 (9.1) | 11.4 (3.5) | ||
| Fungicide | 15 (8) | 12.0 (2.9) | ||
| Antiviral drug | 14 (7.5) | 12.4 (1.6) | ||
| Mathematical approach | Population genetics | 110 (58.8) | 14.2 (2.9) | χ2 = 35.536 d.f. = 2 P < 0.001 |
| Epidemiology | 41 (21.9) | 12.9 (2.5) | ||
| Other | 36 (19.3) | 10.8 (2.5) |