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Study
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Coding manual for cohort studies
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Newcastle–Ottawa Scale
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Turkyilmaz et al. [51]
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Selection
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(1) Representativeness of the exposed cohort
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d
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(2) Selection of the non-exposed cohort
| a☆ |
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(3) Ascertainment of exposure
| a☆ |
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(4) Demonstration that outcome of interest was not present at start of study
| a☆ |
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Comparability
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(1) Comparability of cohorts on the basis of the design or analysis
| a☆ |
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Outcome
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(1) Assessment of outcome
| a☆ |
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(2) Was follow-up long enough for outcomes to occur
| a☆ |
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(3) Adequacy of follow up of cohorts
| a☆ |
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Total Scale
| ☆☆☆☆☆☆☆ |
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De Smet et al. [50]
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Selection
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|
(1) Representativeness of the exposed cohort
|
d
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|
(2) Selection of the non-exposed cohort
| a☆ |
|
(3) Ascertainment of exposure
| a☆ |
|
(4) Demonstration that outcome of interest was not present at start of study
| a☆ |
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Comparability
|
|
(1) Comparability of cohorts on the basis of the design or analysis
| a☆ |
|
Outcome
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|
(1) Assessment of outcome
| a☆ |
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(2) Was follow-up long enough for outcomes to occur
| a☆ |
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(3) Adequacy of follow up of cohorts
| b☆ |
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Total Scale
| ☆☆☆☆☆☆☆ |
- Selection: (1) d: no description of the derivation of the cohort; (2) a: drawn from the same community as the exposed cohort ☆; (3) a: secure record (e.g., surgical records) ☆; (4) a: yes ☆. Comparability: (1) a: study controls for ____ (select the most important factor) ☆. Outcome: (1) a: independent blind assessment ☆; (2) a: yes (select an adequate follow up period for outcome of interest) ☆; (3) a: complete follow up—all subjects accounted for ☆; b) subjects lost to follow up unlikely to introduce bias—small number lost → ____ % (select an adequate %) follow up, or description provided of those lost) ☆
