TABLE 1.

Overview of respondents’ background characteristics and professional activities

Background characteristics	Periodontists in U.S. (n = 393)	Periodontists in Europe (n = 100)	P value
Sex
‐ male	81%	69%	0.009
‐ female	19%	31%
Age (mean ± SD)	51.49 ± 13.671	46.34 ± 10.038	<0.001
Dental school graduation year (mean ± SD)	1991.42 ± 13.823	1995.34 ± 9.695	0.001
Graduate program graduation year (mean ± SD)	1995.99 ± 14.003	2002.82 ± 8.626	<0.001
Lengths of residency in years (mean ± SD)	2.92 ± 2.411	2.97 ± 1.124	0.841
% residency time spent on implant surgeries (mean ± SD)	20.90% ± 21.769	19.86% ± 18.365	0.652
Did you treat patients with PI during your residency?	Yes: 39.7%	Yes: 49%	0.092
How well were you educated about (mean ± SD):
‐ risk factors of PI?	3.02 ± 1.676	3.82 ± 1.290	<0.001
‐ how to diagnose PI?	2.99 ± 1.697	3.85 ± 1.351	< 0.001
‐ treating PI?	2.56 ± 1.563	3.10 ± 1.307	0.001
Percentage of current time at work spent (mean ± SD):
‐ in a private practice setting	76.85% ± 38.129	76.77% ± 36.563	0.870
‐ in a hospital setting	2.04% ± 11.133	5.20% ± 18.134	0.191
‐ as a faculty member	13.0% ± 28.777	12.11% ± 27.668	0.811
‐ in another setting	3.77% ± 18.206	2.80%± 12.233	0.625
Number of hours per week spent at work (mean ± SD)	30.38 ± 13.288	37.72 ± 10.724	<0.001
Number of patients treated per week (mean ± SD)	34.63 ± 30.072	43.90 ± 27.356	0.009
Number of implant surgeries per month (mean ± SD)	13.90 ± 13.323	9.12 ± 13.709	0.003
Number of PI cases per month (mean ± SD)	2.71 ± 3.498	3.45 ± 4.936	0.100