Table 1. Sociodemographic data for the participants (general practitioners and specialists in internal medicine working as primary care physicians; n = 1 106; excludes missing data).

Characteristic	Detail	GPs		Internists		Total
		%	abs.	%	abs.	%	abs.
Age group	29–45 years	22	186	35	86	25	272
	46–60 years	61	523	53	131	60	654
	61–76 years	17	142	12	29	15	171
Sex	Female	33	283	23	58	31	341
	Male	67	570	77	191	69	761
Type of practice	Single-handed practice	46	382	43	107	45	489
	Cooperative practice(group practice, outpatient medical center)	54	454	57	140	55	594
Location of practice	Urban(>100 000 population)	19	162	29	73	21	235
	Town(>20 000 population)	28	240	37	92	30	332
	Rural(<20 000 population)	53	447	34	85	49	532
Length of time work‧ed as doctor treating members of stautory health insurance schemes	≤10 years	30	251	57	141	36	392
	>10 years	70	594	43	107	64	701
Working hours	<40 hours per week	12	105	10	25	12	130
	40–60 hours per week	60	500	58	143	59	643
	>60 hours per week	28	232	32	80	29	312
No of patients ‧treated*1	<500	4	39	5	13	5	52
	500–999	34	284	38	92	34	376
	≥1000	62	519	57	141	61	660

^*1relating to previous quarter; abs.: absolute frequencies; %: relative (proportional) frequency; GP, general practitioner