Table 5.
Stepwise regression analysis summary.
| Model | Predictors included | R 2 | Adjusted R2 | SE of the estimate | F change (df) | P value | Durbin-Watson | ANOVA | ||
|
|
|
|
|
|
|
|
|
F test (df) | P value |
|
| 1 | Constant and length | 0.285 | 0.276 | 0.59888 | 31.563 (1, 79) | <.001 | 2.194 | 31.563 (1, 79) | <.001 |
|
| 2 | Constant, length, and content | 0.445 | 0.431 | 0.53112 | 22.444 (1, 78) | <.001 | 2.004 | 31.287 (1, 78) | <.001 |
|
| 3 | Constant, length, content, and physicians | 0.501 | 0.482 | 0.50681 | 8.663 (1, 77) | .004 | 1.96 | 25.795 (1, 77) | <.001 |
|