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Table 1 Population characteristics by tracking/privacy condition and incentive; results reported as a percentage (%)

From: Impact of different privacy conditions and incentives on survey response rate, participant representativeness, and disclosure of sensitive information: a randomized controlled trial

Characteristic

Overall

By tracking/privacy condition

Incentive

  

Confidential

Anonymized-Envelope

Anonymous-Postcard

$10

$20

 

N = 324

n = 109

n = 109

n = 106

n = 161

n = 163

Age > =50 yrs

35.8

32.1

42.2

33.0

40.4

31.3

Army service

63.0

67.0

59.6

62.3

65.8

60.1

Receiving VA disability benefits

83.3

83.5

83.5

83.0

86.3

80.4

VA visit last yr:

      

 Any type

74.1

76.1

80.7

65.1

77.0

71.2

 Primary care

63.3

62.4

70.6

56.6

62.1

64.4

 Mental health

47.5

50.5

54.1

37.7

51.6

43.6