Less Is More? The Impact of Trauma Volume on the Positive Rate of Head Computed Tomography Scans in Head Trauma Patients

Table 2

Characteristic data of trauma patients on a monthly basis (𝑛=20). Univariate correlation analysis showed an inverse weak correlation between trauma volume and positive rate of head CT scans. There was no significant correlation noted between trauma volume and the other two proportions.

Variable^*	Median	Mean (SD)	Range	Correlation with trauma volume
Trauma volume (persons/month)	1265	1287.6 (92.7)	1147–1486	—
Rate of head trauma patient (%)	19.9	20.1 (1.6)	16.7–23.2	−0.03
Rate of HCT scans performed in head trauma patients (%)	64.3	65.2 (9.9)	48.1–89.7	−0.32
Positive rate of HCT scans (%)	29.6	29.1 (3.4)	21.7–35.7	−0.51^∗∗

^*All variables showed parametric distribution by the Shapiro-Wilk test.
^**Pearson’s correlation with a 𝑃 value less than 0.05.