Table 1.

Estimates obtained in the potential model for procedure time.

	Fluoroscopy time estimated for the first injection			Slope of the curve			Quality of the adjustment
Volunteer	α	Standard error		β	Standard error		R2	Learning rate
1	2.999	0.802		-0.293	0.124		0.283	81.6%
2	1.862	0.441		-0.335*	0.114		0.397	79.3%
3	1.640	0.299		-0.308†	0.088		0.465	80.8%
4	1.315	0.415		-0.319	0.153		0.250	80.2%
5	1.086	0.187		-0.262†	0.083		0.413	83.4%
6	0.818	0.192		-0.253*	0.113		0.262	83.9%
7	1.215	0.185		-0.374‡	0.074		0.648	77.2%
8	1.088	0.153		-0.354‡	0.068		0.657	78.2%
9	0.898	0.102		-0.359‡	0.055		0.754	78.0%
10	1.165	0.113		-0.355‡	0.047		0.803	78.2%
11	1.494	0.254		-0.545‡	0.082		0.757	68.5%
12	0.942	0.087		-0.362‡	0.045		0.824	77.8%
Mean	1.38			-0.34			0.54	78.9%
Standard deviation	0.60			0.07			0.22	3.9%
Coefficient of variation	43.38%			21.81%			40.73%	5.0%

^*p ≤ 0.001 and

^†p ≤ 0.003 for the hypothesis β = 0.