Univariate and multivariate analyses for predictors of percentage change in MBF from baseline and time to vasoconstriction
| Independent predictors . | Univariate P . | Multivariate model P . |
|---|---|---|
| Percentage of change in MBF from baseline | ||
| Type of thermal stimulus | <.0001 | <.0001 |
| Diagnosis (SCD/control) | .02 | .019 |
| Age | .18 | — |
| Sex | .13 | — |
| Hb | .12 | — |
| STAI-Y1 score | .9 | — |
| STAI-Y2 score | .72 | — |
| PASS score | .06 | .026 |
| Time to vasoconstriction | ||
| Type of thermal stimulus | .07 | — |
| Diagnosis (SCD/control) | .02 | .033 |
| Age | .85 | — |
| Sex | .1 | — |
| Hb | .006 | — |
| STAI-Y1 score | .002 | .007 |
| STAI-Y2 score | .24 | — |
| PASS score | .72 | — |
| Independent predictors . | Univariate P . | Multivariate model P . |
|---|---|---|
| Percentage of change in MBF from baseline | ||
| Type of thermal stimulus | <.0001 | <.0001 |
| Diagnosis (SCD/control) | .02 | .019 |
| Age | .18 | — |
| Sex | .13 | — |
| Hb | .12 | — |
| STAI-Y1 score | .9 | — |
| STAI-Y2 score | .72 | — |
| PASS score | .06 | .026 |
| Time to vasoconstriction | ||
| Type of thermal stimulus | .07 | — |
| Diagnosis (SCD/control) | .02 | .033 |
| Age | .85 | — |
| Sex | .1 | — |
| Hb | .006 | — |
| STAI-Y1 score | .002 | .007 |
| STAI-Y2 score | .24 | — |
| PASS score | .72 | — |
The parameters found to be significant by univariate analysis (P < .2; in bold) were used as covariates in the multivariate repeated-measures ANOVA. A stepwise estimation was used to arrive at the final multivariate model shown, with significance level P < .05 (in bold).