TABLE 3.
Multivariable Analysis (Multinomial Logistic Regression) of Initial Evaluation Location Impact on Preoperative Imaging With Adjustment for Other Variables
| Preoperative Imaging | Ultrasound Only | CT Only | CT and Ultrasound | ||||||
|---|---|---|---|---|---|---|---|---|---|
| OR | 95% CI | P | OR | 95% CI | P | OR | 95% CI | P | |
| Initial evaluation | |||||||||
| Community | 0.20 | 0.07–0.58 | .003 | 4.37 | 1.70–11.19 | .002 | 0.99 | 0.34–2.98 | .99 |
| Age, y | 0.88 | 0.76–1.02 | .08 | 1.03 | 0.90–1.18 | .66 | 0.88 | 0.76–1.03 | .11 |
| Female gender | 1.53 | 0.52–4.50 | .44 | 1.30 | 0.47–3.59 | .61 | 4.51 | 1.47–13.82 | .008 |
| Race/ethnicity | |||||||||
| White | 2.63 | 0.59–11.71 | .20 | 5.39 | 1.31–22.19 | .02 | 4.48 | 0.75–26.66 | .10 |
| African American | 3.29 | 0.48–22.50 | .22 | 3.26 | 0.50–21.08 | .22 | 4.42 | 0.48–40.58 | .19 |
| Other | Ref. | Ref. | Ref. | ||||||
| BMI percentile | 0.98 | 0.96–0.99 | .01 | 0.99 | 0.97–1.01 | .16 | 0.98 | 0.96–1.00 | .03 |
| Symptom duration, days | 1.16 | 0.74–1.84 | .52 | 1.44 | 0.93–2.24 | .11 | 1.81 | 1.15–2.86 | .01 |
| WBC count, K/mm3 | 0.96 | 0.87–1.06 | .39 | 0.98 | 0.89–1.07 | .65 | 0.87 | 0.78–0.97 | .01 |
ORs and 95% CI for imaging (ultrasound only, CT scan only, ultrasound and CT) compared with no imaging (reference [Ref.]) are listed. Reference categories are children’s hospital for site of initial evaluation, male for gender, and other for race/ethnicity. OR is change per unit specified for age, BMI percentile, symptom duration, and WBC count.