154 CHAPTER 8 S2: RISK OF BIAS ASSESSMENT ITEMS BASED ON THE NEWCASTLE-OTTAWA QUALITY ASSESSMENT SCALE FOR COHORT STUDIES (NOS). Selection 1. Representativeness of the exposed cohort A. truly representative of the average AF patient without a mechanical heart valve and/or severe mitral valve stenosis who is treated with a NOAC for stroke prevention in the community * B. B somewhat representative of the average AF patient without a mechanical heart valve and/or severe mitral valve stenosis who is treated with a NOAC for stroke prevention in the community * C. s elected group of users e.g. nurses, volunteers D. n o description of the derivation of the cohort 2. Selection of the non-exposed cohort A. d rawn from the same community as the exposed cohort * B. d rawn form a different source C. n o description of the derivation of the non-exposed cohort 3. Ascertainment of exposure A. s ecure record (e.g. surgical records) * B. s tructured interview * C. written self-report D. no description 4. Demonstration that outcome of interest was not present at start of study A. y es * B. no Comparability 1. Comparability of cohorts on the basis of the design or analysis A. s tudy controls for sex and age * B. s tudy controls for any additional factor *
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