Table 2.
Logistic regression results (n=20), where B weights are the linear combination of the explanatory variables, SE, CI and OR is exp(B), −2LL is the negative two log likelihood, R2 is the proportion of variance in the outcome that the model successfully explains, χ2 is used to indicate how well the model fits the data, df is the degrees of freedom and p is the estimated probability of rejecting a true null hypothesis
| Variable | B (SE) | p Value | 95% CI for OR |
||
|---|---|---|---|---|---|
| Lower | OR | Upper | |||
| Constant | −3.207 (3.281) | 0.328 | – | 0.040 | – |
| Maternal age (years) | 0.015 (0.075) | 0.843 | 0.876 | 1.015 | 1.177 |
| BMI (kg/m2) | 0.052 (0.095) | 0.584 | 0.875 | 1.053 | 1.268 |
| Heparan sulfate (ng/mL) | 0.000 (0.095) | 0.887 | 0.997 | 1.000 | 1.003 |
| Hyaluronan (ng/mL) | 0.047 (0.036) | 0.184 | 0.978 | 1.049 | 1.125 |
| Syndecan-1 (ng/mL) | 0.003 (0.002) | 0.237 | 0.998 | 1.003 | 1.007 |
| −2LL | 49.530* | ||||
| R2 | 0.183 (Nagelkerke) | 0.138 (Cox and Snell) | |||
χ2=12.499, df=8, p=0.130.
*Estimation terminated at iteration number 6 because parameter estimate changed <0.001. Initial −2LL=55 452.
df, degrees of freedom.