Annals of Family Medicine -- Schers et al. 2 (5): 462 Table 1

Table 1. Response Rates Within Subgroups

	Responders (Overall Response = 644/873)
Characteristic	Number*	Percent With Characteristic

Age, y
18–40	182/284	64
41–60	270/349	77
61–80	170/210	81
>80	20/24	83
Sex
Female	399/533	75
Male	243/338	72
Chronic illness
Yes	255/314	81
No	380/548	70
Contacts with physician in the last 12 mo (including last visit)
1–2	122/177	69
3–4	154/221	70
5–10	244/310	79
>10	121/162	75

* Because of missing values from sent questionnaires, for which assistants collected baseline characteristics but forgot to fill in some of the data, the number of usable questionnaires ranged from 862 to 871.
${dagger}$ Response rate increasing with age, P <.001 ( ${chi}$ ² for trend).
${ddagger}$ Response rate higher for patients with chronic illness P <.001 ( ${chi}$ ²).
$§$ Response rate increasing with higher contact frequency, P <.016 ( ${chi}$ ² for trend).