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Table 5 Percentage (%) of respondents disclosing potentially sensitive information by tracking/privacy condition and incentive

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

Sensitive information disclosed

Overall

By tracking/privacy condition

By incentive

  

Confidential

Anonymized-Envelope

Anonymous-Postcard

$10

$20

 

N = 196

n = 61

n = 69

n = 66

n = 85

n = 111

Not completely heterosexual

7.8

11.5

4.4

7.9

7.2

8.3

Any sexual abuse ever

20.9

14.8

33.3**

13.6

16.5

24.3

Other traumatic experiences

      

  Combat during Gulf War I

78.6

90.2

72.1

74.5

80.7

77.7

  Childhood physical abuse

64.3

57.4

59.4

75.8

61.2

66.7

 Past-year events:

      

  Economic hardship

43.3

41.0

42.6

46.2

39.8

45.9

  Emotional abuse/neglect

22.6

23.3

25.7

18.5

26.2

19.8

  Crime victim

10.8

9.8

13.0

9.2

9.6

11.6

  Physical attack

5.2

6.7

7.2

1.5

1.2

0.9

Positive mental health screens:

      

 Depression

44.6

50.8

47.8

35.4

52.4

39.1

 PTSD

79.2

85.2

77.1

75.8

83.5

75.9

 Problem drinking

35.1

31.1

28.6

34.8

36.5

27.7

  1. Bold face font signifies a statistically significant difference across groups.
  2. **p ≤ 0.01.