TABLE 2.
Linear regression model was performed using the backpropagation method, excluding variables from the model that do not have a significant impact on the variance explained in the levels of IGFBP-7 and MIP-1β.
| IGFBP-7 plasma levels (ng/mL) | ||||||
|---|---|---|---|---|---|---|
| Predictors | F (df1, df2) | R | p-value | β | SD | p-value |
| Model 1 | 2.93 (2, 39) | 0.137 | 0.066 | 51.35 | 89.95 | 0.572 |
| Group | 72.24 | 30.59 | 0.024 | |||
| Age | 0.38 | 1.79 | 0.831 | |||
| Model 2 | 5.97 (1, 39) | 0.136 | 0.019 | 70.09 | 21.16 | 0.002 |
| Group | 73.12 | 29.93 | 0.019 | |||
| MIP-1β plasma levels (pg/mL) | ||||||
| Model 1 | 4.02 (2, 39) | 0.178 | 0.026 | −78.54 | 89.95 | 0.190 |
| Group | 31.17 | 20.01 | 0.128 | |||
| Age | 2.50 | 1.17 | 0.039 | |||
| Model 2 | 5.41 (1, 39) | 0.125 | 0.026 | −75.22 | 59.90 | 0.217 |
| Age | 2.75 | 1.18 | 0.026 | |||
Df1, degrees of freedom of the independent variables; df2, degrees of freedom of the dependent variable; R2, R-squared; p-value, p-value of the regression equation of each model; β, beta coefficient; SD, standard deviation of the beta coefficients; p = p-value of the beta coefficients. The group is a dichotomic variable formed from mental conditions (controls, bipolar disorder). Age is a continuous variable. IGFBP, insulin-like growth factor-binding protein; MIP-1β, macrophage inflammatory protein 1 beta.