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Table 2 Among participants in the Victory Trial with both data sources available, agreement between 6 month prolonged abstinence from smoking by survey, and Health Factor data drawn from different time intervals, and different sites. (n = 1713)

From: Validating the use of veterans affairs tobacco health factors for assessing change in smoking status: accuracy, availability, and approach

 

% Available by Data Source

% Quitter by Follow-up Survey

% Quitter by Health Factor

% Quitter concordant Health Factor and Survey

Sensitivity (95% CI)

Specificity (95% CI)

Kappa (95% CI)

% Agreement

Agreement by Date Range:

Health Factor Data within +/− 120 days of Survey Mailing (n = 1713)

(full population)

100%

10.6%

10.9%

5.8%

54.4

(41.1, 67.7)

94.3

(87.5, 100.0)

0.48

(0.41, 0.55)

90.0%

Health Factor Data within +/− 90 days of Survey Mailing (n = 1357)

79.2%

10.6%

10.8%

5.6%

52.8

(38.1, 67.4)

94.1

(86.5, 100.0)

0.47

(0.39,0.54)

89.8%

Health Factor Data within +/− 60 days of Survey Mailing (n = 951)

55.5%

10.3%

10.2%

5.1%

49.0

(32.1, 65.9)

94.3

(85.2, 100.0)

0.43

(0.34, 0.53)

89.6%

Health Factor Data within +/− 30 days of Survey Mailing (n = 548)

32.0%

9.3%

8.9%

4.6%

49.0

(25.6, 72.5)

95.2

(83.2, 100.0)

0.45

(0.32, 0.58)

90.9%

Agreement by Site:

Site A (n = 620)

36.2%

11.9%

10.7%

5.2%

43.2

(25.3, 61.2)

93.8

(82.5–100.0)

0.39

(0.28, 0.50)

87.7%

Site B (n = 492)

28.7%

9.6%

13.8%

7.3%

76.6

(43.3, 100.0)

92.8

(80.4–100.0)

0.59

(0.47, 0.69)

91.3%

Site C (n = 22)

1.3%

9.1%

9.1%

9.1%

N/A

N/A

N/A

N/A

Site D (n = 579)

33.8%

10.2%

8.8%

5.0%

49.2

(27.3, 71.0)

95.8

(84.0, 100.0)

0.48

(0.36, 0.60)

91.0%

  1. Note: Survey data is considered the gold standard for this calculation. Site C excluded from analysis of agreement due to low numbers with health factor data