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    • Regression analysis with categorized regression calibrated exposure. Some interesting findings 

      Dalen, Ingvild; Hjartåker, Anette; Buonaccorsi, John P.; Laake, Petter; Thoresen, Magne (Journal article; Tidsskriftartikkel; Peer reviewed, 2006-07-04)
      Background: Regression calibration as a method for handling measurement error is becoming increasingly well-known and used in epidemiologic research. However, the standard version of the method is not appropriate for exposure analyzed on a categorical (e.g. quintile) scale, an approach commonly used in epidemiologic studies. A tempting solution could then be to use the predicted continuous ...
    • Test-retest reproducibility of a food frequency questionnaire (FFQ) and estimated effects on disease risk in the Norwegian Women and Cancer Study (NOWAC) 

      Lund, Eiliv; Parr, Christine L.; Veierød, Marit B.; Laake, Petter; Hjartåker, Anette (Journal article; Tidsskriftartikkel; Peer reviewed, 2006-01-31)
      Background: The Norwegian Women and Cancer Study (NOWAC) is a national population-based cohort study with 102 443 women enrolled at age 30–70 y from 1991 to 1997. The present study was a methodological sub-study to assess the test-retest reproducibility of the NOWAC food frequency questionnaire (FFQ), and to study how measurement errors in the data can affect estimates of disease risk. Methods: A ...