Table 2.
Descriptive statistics of the three readability indexes and length by studied year and results of the hypothesis tests.
| Variable and year | n | Mean (SD) | 95% CI | Median | Range | P | |
| SMOG grade |
|
|
|
|
|
.40a | |
|
|
2007 | 36 | 17.1 (1.0) | 16.8-17.4 | 17.1 | 14.8-19.2 |
|
|
|
2010 | 36 | 17.1 (0.8) | 16.9-17.4 | 17.3 | 14.8-18.6 |
|
|
|
2013 | 36 | 17.2 (0.9) | 16.9-17.5 | 17.4 | 15.2-18.7 |
|
| Flesch-Kincaid grade level |
|
|
|
|
|
.22b | |
|
|
2007 | 36 | 16.6 (1.3) | 16.2-17.1 | 16.6 | 13.3-19.5 |
|
|
|
2010 | 36 | 16.5 (1.1) | 16.1-16.9 | 16.6 | 13.4-18.5 |
|
|
|
2013 | 36 | 16.6 (1.1) | 16.2-16.9 | 16.9 | 13.6-18.6 |
|
| Szigriszt’s perspicuity index |
|
|
|
|
|
.20b | |
|
|
2007 | 36 | 56.2 (5.2) | 54.4-58.0 | 56.2 | 45.4-68.4 |
|
|
|
2010 | 36 | 57.3 (4.3) | 55.8-58.8 | 56.9 | 50.5-68.1 |
|
|
|
2013 | 36 | 57.1 (4.2) | 55.7-58.5 | 56.0 | 51.6-67.3 |
|
| Length |
|
|
|
|
|
.002b | |
|
|
2007 | 36 | 1939 (1031) | 1590-2288 | 1681 | 548-4868 |
|
|
|
2010 | 36 | 2091 (1210) | 1682-2501 | 1817 | 526-5463 |
|
|
|
2013 | 36 | 2238 (1335) | 1786-2690 | 1866 | 534-5752 |
|
a Repeated-measures ANOVA.
b Friedman test.