Table 3.
Influences of the fixed factors on Q50 frequency (Hz); results of the full model (full vs. null: chisq = 4330.685, df = 7, P < 0.001).
| Estimate | SE | df | χ2 | P | |
|---|---|---|---|---|---|
| (Intercept) | 967.260 | 13.343 | a | a | a |
| Unit (2)b,c | −104.697 | 2.748 | 3 | 4193.205 | < 0.001 |
| Unit (3)b,c | −257.122 | 3.819 | |||
| Unit (4)b,c | −364.181 | 9.780 | |||
| Sex (Male)b,c | 36.067 | 6.479 | 1 | 21.804 | < 0.001 |
| Age Cohort (Non-adult)b,c | 9.396 | 6.652 | 1 | 1.984 | 0.159 |
| DP TYPE (DP3)b,c | 33.106 | 2.857 | 2 | 375.086 | < 0.001 |
| DP TYPE (DP4)b,c | 101.427 | 5.430 |
a
Not shown as not having a meaningful interpretation.
b
Estimate ± SE refer to the difference of the response between the reported level of this categorical predictor and the reference category of the same predictor.
c
These predictors were dummy coded, with the “Unit (1),” “Sex (Female),” “Age Cohort (Adult),” and “DP TYPE (DP2)” being the reference categories.