2012
In 2012, DR had the highest number of ultrasound providers (12682) followed by ENDO (1241), OTO (224) and GS (191). Consequently DR (416712) performed the most ultrasounds followed by ENDO (108124), OTO (11464) and GS (7488). Overall ANOVA showed a difference in the average numbers of ultrasounds performed by providers of each specialty (p<0.001). ENDO averaged the most (87.05 ± 3.17) while OTO averaged 51.18 ± 4.87 and GS and DR had no significant different in average numbers performed (39.2 ± 2.57 vs 32.86 ± 0.32, p>0.05)(rest ps<0.01).
Charges submitted
An overall difference existed on ANOVA (p<0.001). There was no difference between GS and ENDO ($233.52 ± 8.04 vs $223.94 ± 2.54 , p>0.05)
OTO ($253.80 ± 9.78) was more than the other three (p<0.01). ENDO and GS was more than DR ($149.98 ± 0.87)(p<0.01)
Reimbursements
Overall differences existed(p<0.001). ENDO ($86.27 ± 0.64) and OTO ($83.18 ± 1.40) collected the same average, and also remained higher than both of the other specialties, GS $73.05 ± 2.10 and DR $37.71 ± 0.28 (p<0.01). All three point of care specialties collected more than DR (p<0.01)
Superusers
The number of super users, those with >100 US/year were OTO (22/224, 10.0%), GS (11/191, 5.8%), ENDO (340/1242, 27.4%), and DR (430/12682, 3.4%) (one way ANOVA p<0.001). Further breakdown of the ANOVA with Tukey HSD test demonstrates that ENDO has more superusers than all three of the other subspecialties (vs OTO p<0.01, vs GS p<0.01, vs DR p<0.01). There were also more OTO superusers than GS (p<0.05) and DR (p<0.01) superusers. No difference existed between GS and DR.