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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