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Relationship between full text average reading grade level and the independent variables in the ANCOVA model.
| Independent variables | Estimates | SE | p-value | Multiple |
|---|---|---|---|---|
| comparison | ||||
| Publication year | -0.037 | 0.058 | 0.531 | |
| Impact factor | 0.100 | 0.042 | 0.020 | |
| Article type | <0.001 | (1) = (2) < (3) | ||
| Experimental articles (1) | -2.017 | 0.488 | ||
| Methodology papers (2) | -2.068 | 0.444 | ||
| Reviews/meta-analyses (3) | 0 | |||
| Intercept | 89.179 | 116.714 | 0.448 | |
