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Table 1 Characteristics of the EPIC-PANACEA Cohort

From: Determinants of non- response to a second assessment of lifestyle factors and body weight in the EPIC-PANACEA study

EPIC-PANACEA centersa

Total baseline population n

Mean age yrs (SD)

Mean follow-up time yrs (SD)

Method of contacting for 2ndassessment

Not (yet) contacted n (%)

Death n (%)

(E) migrated n (%)

2nd assessment missingbn (%)

Nonresponsec n (%)

Heidelberg (GE)

24,954

51.0 (8.1)

2.1 (0.6)

P

0

129 (0.5)

na

1,771 (7.1)

1,642 (6.6)

Spain

40,418

49.3 (8.0)

3.3 (0.4)

T

0

202 (0.5)

na

703 (1.7)

501 (1.2)

France

71,910

52.9 (6.7)

3.4 (0.8)

P

0

382 (0.5)

na

4,544 (6.3)

4,162 (5.8)

Cambridge (UK)

24,818

59.3 (9.3)

3.7 (0.7)

C

0

637 (2.6)

0

10,199 (41.1)

9,562 (39.5)

Utrecht (NL)

16,869

57.7 (6.0)

4.4 (0.8)

P

0

225 (1.3)

859 (5.1)

4,723 (28.0)

3,639 (23.1)

Malmo (SW)

27,463

58.1 (7.6)

4.9 (0.5)

P

0

776 (2.8)

na

5,832 (21.2)

5,056 (18.9)

Doetinchem (NL)

7,139

44.0 (11.8)

5.0 (0.2)

C

1,101 (15.5)

68 (1.0)

80 (1.1)

2,584 (36.2)

1332 (22.6)

Denmark

55,753

56.7 (4.4)

5.3 (0.3)

P

0

1,610 (2.9)

317 (0.6)

11,594 (20.8)

9,667 (18.0)

Oxford (UK) Health Conscious

47,208

44.5 (14.5)

5.3 (0.5)

P

0

827 (1.8)

393 (0.8)

17,188 (36.4)

15,968 (34.7)

Oxford (UK) General Health

7,221

53.1 (7.9)

5.6 (0.6)

P

0

138 (1.9)

29 (0.4)

1,945 (26.9)

1,778 (25.2)

Norway

35,829

48.2 (4.3)

6.2 (0.5)

P

0

375 (1.0)

157 (0.4)

9,491 (26.5)

8,959 (25.4)

Amsterdam/Maastricht (NL)

14,920

42.3 (10.9)

6.2 (1.1)

P

0

163 (1.1)

533 (3.6)

5,483 (36.7)

4,787 (33.7)

Greece

25,997

53.2 (12.6)

7.7 (2.1)

T

0

590 (2.3)

na

1,832 (5.3)

792 (3.1)

Potsdam (GE)

26,891

50.5 (9.0)

8.5 (0.9)

P

4,282 (15.9)

827 (3.1)

na

8,528 (31.7)

3,419 (15.7)

Naples (IT)

4,947

50.3 (7.7)

8.7 (1.2)

P

4,271 (86.3)

1 (0.0)

0

4356 (88.1)

84 (12.4)

Florence (IT)

13,089

51.6 (7.7)

9.3 (1,1)

P

0

230 (1.8)

108 (0.8)

2,883 (22.0)

2,545 (20.0)

Umea (SW)

25,048

46.1 (10.3)

9.9 (0.3)

P

0

759 (3.0)

1012 (4.0)

11,501 (45.9)

9,730 (41.8)

Varese (IT)

11,797

51.6 (8.2)

11.1 (1.1)

P/T

0

287 (2.4)

209 (1.8)

1,749 (14.8)

1,253 (11.1)

Ragusa (IT)d

5,949

47.3 (7.6)

-

-

5,949 (100)

-

-

5,949 (100)

-

Turin (IT)d

9,749

50.2 (7.7)

-

-

9,749 (100)

-

-

9,749 (100)

-

Total

497,969

51.5 (9.9)

5.3 (2.4)

 

25,355 (5.1)

8,226 (1.7)

3,697 (0.7)

122,154 (24.5)

84,876 (18.4)

  1. Abbreviation: yrs - years, SD – standard deviation, na - no information available, C - 2nd assessment at study center; P - 2nd assessment by postal survey; T - 2nd assessment by telephone interview.
  2. a Multiple centers within a country were treated as a single study center, when length of follow-up and data collection methods did not differ and when coordination took place out of one center (Spain, France, Denmark). In Norway and Greece only one research center was situated.
  3. b Percentage corresponds to the overall response rates calculated according to the standard definitions used by the American Association for Public Opinion Research (AAPOR) [20].
  4. c For calculation of the proportion non-response, baseline participants who were not (yet) approached, died or emigrated before the second assessment were excluded (n = 37,278).
  5. d Ragusa and Turin did not contact any of their participants for a second assessment yet.
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BMC Medical Research Methodology

ISSN: 1471-2288

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