HIDDEN BIASES IN OBSERVATIONAL STUDIES AND NON RANDOMIZED CLINICAL TRIALS; A SENSITIVITY ANALYSIS FOR THEIR RECOGNITION AND CONTROL

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FALLAHZADEH H.; BABAIE GH.; KAZEMNEJAD ANOUSHIRAVAN; MASHKANI M.R.

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Journal: Journal of Shahid Sadoughi University of Medical Sciences Year:2003 | Volume:11 | Issue:1(Supplement on Health) Page(s): 3-9

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Title

HIDDEN BIASES IN OBSERVATIONAL STUDIES AND NON RANDOMIZED CLINICAL TRIALS; A SENSITIVITY ANALYSIS FOR THEIR RECOGNITION AND CONTROL

Author(s)

FALLAHZADEH H. | BABAIE GH. | KAZEMNEJAD ANOUSHIRAVAN | MASHKANI M.R. | Issue Writer Certificate

Keywords

BIASQ4

HIDDEN BIASQ4

OBSERVATIONAL STUDYQ4

SENSITIVITY ANALYSISQ4

NONRANDOMIZED CLINICAL TRIALQ4

Abstract

In observational studies or non-randomized clinical trials, treated and control groups may differ in their outcomes even if the treatment or exposure has no effect. This may happen if the groups were not comparable before the start of treatment. The groups may not be comparable in two respects; they may differ with respect to variables that have been measured in which case there is an overt BIAS, or that they may differ in ways that have not been measured, in this case there is a hidden BIAS . Overt BIASes are controled though adjustments such as maching or grouping. Hidden BIAS is more difficult to address because the relevant variables are not available. In this paper we used SENSITIVITY ANALYSIS that have been represented and first we introduced software for difficult calculations of SENSITIVITY ANALYSIS. This applied for a true OBSERVATIONAL STUDY.

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APA: Copy

FALLAHZADEH, H., BABAIE, GH., KAZEMNEJAD, ANOUSHIRAVAN, & MASHKANI, M.R.. (2003). HIDDEN BIASES IN OBSERVATIONAL STUDIES AND NON RANDOMIZED CLINICAL TRIALS; A SENSITIVITY ANALYSIS FOR THEIR RECOGNITION AND CONTROL. JOURNAL OF SHAHID SADOUGHI UNIVERSITY OF MEDICAL SCIENCES, 11(1(Supplement on Health)), 3-9. SID. https://sid.ir/paper/35672/en

Vancouver: Copy

FALLAHZADEH H., BABAIE GH., KAZEMNEJAD ANOUSHIRAVAN, MASHKANI M.R.. HIDDEN BIASES IN OBSERVATIONAL STUDIES AND NON RANDOMIZED CLINICAL TRIALS; A SENSITIVITY ANALYSIS FOR THEIR RECOGNITION AND CONTROL. JOURNAL OF SHAHID SADOUGHI UNIVERSITY OF MEDICAL SCIENCES[Internet]. 2003;11(1(Supplement on Health)):3-9. Available from: https://sid.ir/paper/35672/en

IEEE: Copy

H. FALLAHZADEH, GH. BABAIE, ANOUSHIRAVAN KAZEMNEJAD, and M.R. MASHKANI, “HIDDEN BIASES IN OBSERVATIONAL STUDIES AND NON RANDOMIZED CLINICAL TRIALS; A SENSITIVITY ANALYSIS FOR THEIR RECOGNITION AND CONTROL,” JOURNAL OF SHAHID SADOUGHI UNIVERSITY OF MEDICAL SCIENCES, vol. 11, no. 1(Supplement on Health), pp. 3–9, 2003, [Online]. Available: https://sid.ir/paper/35672/en

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