Table I.

Patient Demographics

Parameter	US Fracture Present	No US Fracture	P-value*
No. of patients enrolled	88	56	N/A
Age (range)	49 (18-86)	52 (18-83)	0.28
Male	32 (36%)	16 (29%)	0.33
Right hand dominant	82 (93%)	53 (95%)	0.72
Dominant hand injured	44 (50%)	21 (38%)	0.14
Caucasian	80 (91%)	51 (91%)	0.97
Education level**			0.54
No college	19 (22%)	9 (16%)
College	39 (44%)	28 (50%)
Graduate degree	23 (26%)	19 (34%)
Income level**			0.11
<$70,000	46 (52%)	24 (43%)
≥$70,000	30 (34%)	28 (50%)

N/A, not applicable

^*Based on student's t-test for age, and chi-square test for all other variables

^**Nine patients in the "US fracture present" cohort did not respond to the question regarding education level. Ten patients in the "US fracture present" cohort and 4 patients in the "no US fracture" cohort did not respond to the question regarding income level. This resulted in 13 patients in the "US fracture present" cohort and 4 patients in the "no US fracture" cohort with incomplete information on potential confounders. These patients were not included in regression analysis.