Table 1.

Characteristics of the study sample (n=546).

Characteristics		Mean (SD) or n (%)
Age in years		53.14 (15.4)
Gender
	Men	238 (43.6)
	Women	308 (56.4)
Level of education
	Low	69 (12.6)
	Medium	306 (56.0)
	High	156 (28.6)
	Unknown	15 (2.8)
Chronic condition (self-reported)
	None	132 (24.2)
	At least one	365 (66.8)
	Unknown	49 (9.0)
Internet usage
	No internet	35 (6.4)
	(Very) difficult or neutral (score 1, 2, 3)	141 (25.8)
	(Very) easy (score 4, 5)	352 (64.5)
	Unknown	18 (3.3)
Data collection
	By post	189 (34.6)
	By internet	357 (65.4)