Table 2.
Results of linear regression models with depressive symptom scores as the dependent variable
| A. Model summary | ||||||
|---|---|---|---|---|---|---|
| R2 | ΔR2 | F change | df1 | df2 | p | |
| Unadjusted | 0.0144 | 44.31 | 1 | 3033 | <0.0001 | |
| Model 1 | 0.0754 | 0.0610 | 24.95 | 8 | 3025 | <0.0001 |
| Model 2 | 0.0841 | 0.0087 | 7.19 | 4 | 3021 | <0.0001 |
| Model 3 | 0.1109 | 0.0267 | 18.13 | 5 | 3016 | <0.0001 |
| B. Overview of coefficients | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dependent: | Unadjusted | Model 1 | Model 2 | Model 3 | |||||||||
| PHQ-9 sum score | B | t | p | B | t | p | B | t | p | B | t | p | |
| Shannon | −0.1200 | −6.66 | 0.0000 | −0.0729 | −3.84 | 0.0001 | −0.0602 | −3.15 | 0.0016 | −0.0422 | −2.22 | 0.0263 | |
| Gender | (Women = 1) | 0.1154 | 6.52 | 0.0000 | 0.1266 | 6.82 | 0.0000 | 0.1186 | 6.45 | 0.0000 | |||
| Age | −0.0388 | −2.06 | 0.0397 | −0.0406 | −2.13 | 0.0333 | −0.0656 | −3.38 | 0.0007 | ||||
| Education | −0.0426 | −2.10 | 0.0360 | −0.0346 | −1.68 | 0.0922 | −0.0227 | −1.12 | 0.2627 | ||||
| Smoker | (Yes = 1) | 0.0380 | 2.04 | 0.0410 | 0.0395 | 2.15 | 0.0314 | ||||||
| Physical activity | (min/wk*intensity) | −0.0440 | −2.49 | 0.0127 | −0.0371 | −2.13 | 0.0333 | ||||||
| Audit alcohol | (sum) | 0.0614 | 2.99 | 0.0028 | 0.0588 | 2.90 | 0.0037 | ||||||
| BMI | (kg/m2) | 0.0519 | 2.74 | 0.0062 | 0.0444 | 2.35 | 0.0188 | ||||||
| GI disorder | (yes = 1) | 0.1027 | 5.85 | 0.0000 | |||||||||
| Diabetes | (yes = 1) | 0.0624 | 3.36 | 0.0008 | |||||||||
| Diarrhea | (yes = 1) | 0.0799 | 4.57 | 0.0000 | |||||||||
| PPI | (yes = 1) | 0.0394 | 2.19 | 0.0284 | |||||||||
| Antibiotics | (yes = 1) | 0.0264 | 1.53 | 0.1267 | |||||||||
Tables present a model summary (A) and an overview of standardized regression coefficients (β) of predictor and covariates. Unstandardized values and constants are omitted for clarity. Models 1 to 3 also include ethnicity. Coefficients for ethnicity are reported separately in the text.