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Estimating the Proportion of Health-Related Websites Disclosing Information That Can Be Used to Assess Their Quality

Final Report - May 30, 2006


Appendix C
Baseline Estimates of Compliance



Table C1. Estimates of Compliance with Criteria and Associated Elements of Disclosure, All Health Websites

 

All Health Websites

Criterion/Disclosure Element

Number (n=102)

Percent

SE

RSE (%)

Lower bound 95% CI

Upper bound 95% CI

Identity

12

8.5

3.59

42.19

3.6

18.9

Name

91

91.6

3.59

3.92

81.2

96.5

Street address

61

54.8

6.59

12.03

41.7

67.3

Funding sources

22

20.2

5.29

26.18

11.7

32.7

Purpose

44

35.2

6.27

17.79

24.0

48.4

Purpose or mission

67

64.3

6.35

9.88

50.9

75.7

Uses and limitations

79

71.0

6.05

8.52

57.8

81.5

Association with commercial products

67

60.8

6.48

10.66

47.5

72.7

Content

2

0.3

0.16

59.26

0.1

0.9

Identify advertising content

82

74.9

5.80

7.75

61.8

84.6

Describe editorial policy

12

5.1

2.61

51.58

1.8

13.5

Authorshipa

21

11.4

3.98

34.79

5.6

22.0

Privacy

85

75.3

5.79

7.69

62.1

85.0

Privacy policy

88

79.1

5.47

6.91

66.3

88.0

Describe protection of personal information

85

75.3

5.79

7.69

62.1

85.0

User Feedback

65

58.8

6.52

11.09

45.5

70.9

Feedback mechanism

65

58.8

6.52

11.09

45.5

70.9

Content Updating

1

0.1

0.12

92.31

0.02

0.8

Display date createda

8

4.5

2.60

57.52

1.4

13.5

Display date reviewed or updateda

11

3.2

1.88

58.75

1.0

9.9

Source: Computations by Mathematica Policy Research, Inc.
Note: Number=number of websites in sample found compliant
Percent=weighted percent of all websites estimated to be in compliance
SE= standard error of weighted percentage estimate
RSE=relative standard error (the standard error divided by the percentage estimate)
CI=confidence interval of weighted percentage estimate
Shading indicates estimates that are unreliable, due to large standard error relative to small percentage estimates.
aThis criterion element must be fulfilled for all three pages of health content evaluated.

 

Table C2. Estimates of Compliance with Criteria and Associated Elements of Disclosure, by Stratum

 

Frequently Visited Sites

 

Remainder Sites

Criterion/Disclosure Element

Number (n=52)

Percent

SE

RSE (%)

Lower bound 95% CI

Upper bound 95% CI

 

Number (n=50)

Percent

SE

RSE (%)

Lower bound 95% CI

Upper bound 95% CI

Identity

8

15.4

4.39

28.54

8.5

26.2

 

4

8.0

3.85

48.13

3.0

19.7

Name

45

86.5

4.16

4.81

76.0

92.9

 

46

92.0

3.85

4.18

80.3

97.0

Street address

34

65.4

5.79

8.86

53.2

75.8

 

27

54.0

7.07

13.09

40.0

67.4

Funding sources

12

23.1

5.13

22.23

14.5

34.7

 

10

20.0

5.67

28.35

11.0

33.6

Purpose

27

51.9*

6.08

11.71

40.0

63.7

 

17

34.0

6.72

19.76

22.2

48.3

Purpose or mission

35

67.3

5.71

8.48

55.2

77.5

 

32

64.0

6.81

10.64

49.7

76.2

Uses and limitations

44

84.6

4.39

5.19

73.8

91.5

 

35

70.0

6.50

9.29

55.8

81.2

Association with commercial products

37

71.2

5.52

7.76

59.1

80.8

 

30

60.0

6.95

11.58

45.8

72.7

Content

2

3.9

2.34

60.78

1.1

12.3

 

0

0.0

0.00

n.a.

n.a.

n.a.

Identify advertising content

45

86.5

4.16

4.81

76.0

92.9

 

37

74.0

6.22

8.41

60.0

84.4

Describe editorial policy

10

19.2*

4.80

24.96

11.4

30.5

 

2

4.0

2.78

69.50

1.0

14.9

Authorship

16

30.8*

5.62

18.26

20.9

42.9

 

5

10.0

4.25

42.50

4.2

22.1

Privacy

48

92.3*

3.24

3.51

82.9

96.7

 

37

74.0

6.22

8.41

60.0

84.4

Privacy policy

49

94.2*

2.84

3.01

85.3

97.9

 

39

78.0

5.87

7.53

64.3

87.5

Describe protection of personal information

48

92.3*

6.24

6.76

82.9

96.7

 

37

74.0

6.22

8.41

60.0

84.4

User Feedback

36

69.2

5.62

8.12

57.1

79.2

 

29

58.0

7.00

12.07

43.9

71.0

Feedback mechanism

36

69.2

5.62

8.12

57.1

79.2

 

29

58.0

7.00

12.07

43.9

71.0

Content Updating

1

1.9

1.67

86.98

0.3

10.2

 

0

0.0

0.00

n.a.

n.a.

n.a.

Display date createda

6

11.5

3.89

33.71

5.8

21.7

 

2

4.0

2.78

69.50

1.0

14.9

Display date reviewed or updateda,*

10

19.2*

4.80

24.96

11.4

30.5

 

1

2.0

1.99

99.50

0.3

13.2

Source: Computations by Mathematica Policy Research, Inc.
Note: Number=number of websites in stratum found compliant
Percent=percent of websites in stratum estimated to be in compliance
SE= standard error of the percentage estimate
RSE= relative standard error (the standard error divided by the percentage estimate)
CI= confidence interval of percentage estimate
n.a. = Not applicable due to a zero estimate and standard error
Shading indicates estimates that are unreliable, due to large standard error relative to small percentage estimates.
aThis criterion element must be fulfilled for all three pages of health content evaluated.
*Difference in estimated percentages for "frequently visited sites" compared to "remainder sites" is statistically significant at the 95 percent level of confidence based on student's t-test of independent samples.


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