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Table 3 Multivariate analysis of risk factors associated with a positive QFT

From: Screening for latent tuberculosis in Norwegian health care workers: high frequency of discordant tuberculin skin test positive and interferon-gamma release assay negative results

  Univariate (N = 13) Multivariate (N = 13)
Characteristics OR (95% CI) P-value OR (95% CI) P-value
Female 3.54 (1.12, 11.21) .031 2.59 (0.76, 8.86) .131
Age 1.04 (0.99, 1.09) .141 1.03 (0.98, 1.08) .259
Origin 9.05 (2.20, 37.16) .002 14.13 (1.37, 145.38) .026
Stay in TB endemic country 0.74 (0.22, 2.45) .681 0.80 (0.31, 2.04) .632
  1. OR; odds ratio; CI; confidence interval; OR per standard-deviation increase for continuous variables Age; Origin; country of birth, divided into three groups, 1) Norway, 2) other TB low- endemic countries, 3) TB endemic countries; Stay in TB endemic country; stayed and/or worked in TB endemic country (>2 weeks).
  2. Exposure to TB was too unbalanced to produce definite confidence intervals and therefore not reported.