Total number of items | Decade | ||||
---|---|---|---|---|---|
 | 1970s (n = 5) | 1980s (n = 47) | 1990s (n = 186) | 2000s (n = 13) | Total (n = 251) |
Title = 1,n% | 2 (40.0) | 29 (61.7) | 144 (77.4) | 12 (92.3) | 187 (74.5) |
Introduction = 1, n % | 5 (100.0) | 42 (89.4) | 170 (91.4) | 11 (84.6) | 228 (90.8) |
Methods = 18, mean (sd) | 5.0 (3.7) | 5.8 (1.8) | 7.1 (2.6) | 6.5 (2.9) | 6.8 (2.5) |
Results = 9, mean (sd) | 1.0 (1.0) | 1.6 (0.9) | 2.5 (1.8) | 2.2 (1.9) | 2.3 (1.7) |
Discussion = 3, mean (sd) | 1.2(1.3) | 2.0 (1.1) | 2.1 (1.0) | 1.9 (1.1) | 2.0 (1.0) |
Total = 32, mean (sd) | 8.6 (5.4) | 10.8 (3.0) | 13.4 (4.3) | 12.3 (5.3) | 12.7 (4.3) |