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Table 2 Response rate overall by sex, age and marital status. Percent (descriptive) and OR (logistic regression)

From: Can targeted cover letters improve participation in health surveys? Results from a randomized controlled trial

 

Control group (treatment group 1/generic letter) (%)

N (Treatment group 1)

Intervention groups (treatment group 2–11/specific letter) (%)

N (Treatment group 2–11)

OR (specific vs. generic)

95% CI

 

Total

57.7

4000

55.8

21000

0.93

(0.87–0.99)

P = 0.028

Sex

 Men

52.6

1993

51.4

10449

0.95

(0.86–1.05)

p = 0.302

 Women

62.7

2007

60.2

10551

0.90

(0.82–0.99)

p = 0.034

Age

 16–24 years

42.6

566

46.6

2975

1.18

(0.98–1.41)

p = 0.077

 25–44 years

49.3

1150

47.4

6187

0.93

(0.82–1.05)

p = 0.232

 45–64 years

64.3

1350

61.3

6856

0.88

(0.78–0.99)

p = 0.037

 ≥65 years

67.6

934

64.1

4982

0.86

(0.74–1.00)

p = 0.044

Men

 16–24 years

35.9

281

40.2

1529

1.20

(0.92–1.56)

P = 0.178

 25–44 years

41.8

588

40.7

3195

0.95

(0.80–1.14)

P = 0.592

 45–64 years

57.9

707

56.9

3454

0.96

(0.82–1.13)

P = 0.639

 ≥65 years

70.3

417

65.6

2271

0.81

(0.64–1.01)

P = 0.063

Women

 16–24 years

49.1

285

53.4

1446

1.19

(0.92–1.53)

P = 0.187

 25–44 years

57.1

562

54.6

2992

0.90

(0.75–1.08)

P = 0.267

 45–64 years

71.4

643

65.7

3402

0.77

(0.64–0.93)

P = 0.005

 ≥65 years

65.4

517

62.9

2711

0.90

(0.74–1.10)

P = 0.290

Marital status

 Married

67.9

1847

63.7

9715

0.83

(0.75–0.92)

P = 0.001

 Divorced

56.5

1448

54.5

7690

0.92

(0.75–1.13)

P = 0.441

 Widowed

54.1

439

55.2

2305

1.04

(0.80–1.36)

p = 0.752

 Unmarried

45.7

266

46.3

1290

1.03

(0.92–1.15)

P = 0.665

Ethnic background

 Danish

61.1

3480

58.5

18442

0.90

(0.83–0.97)

P = 0.005

 Western

38.1

205

41.3

991

1.14

(0.84–1.56)

P = 0.393

 Non-western

33.0

315

33.2

1597

1.01

(0.78–1.30)

P = 0.954