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. 2013 Oct;20(5):e420–e441. doi: 10.3747/co.20.1469

TABLE B.I.

Scoring form for cohort studies

B.1.

Selection
  1. Representativeness of the exposed cohort
    1. Truly representative of patients with advanced colorectal cancer in the communitya
    2. Somewhat representative of patients with advanced colorectal cancer in the communitya
    3. Selected group
    4. No description of the derivation of the cohort
  2. Selection of the non-exposed cohort
    1. Drawn from the same community as the exposed cohorta
    2. Drawn from a different source
    3. No description of the derivation of the non-exposed cohort
  3. Ascertainment of exposure
    1. Secure recorda
    2. Structured interviewa
    3. Written self-report
    4. No description
  4. Demonstration that the outcome of interest was not present at study start
    1. Yesa
    2. No
Comparability
  1. Comparability of the cohorts based on the design or analysis
    1. Study controls for symptomsa
    2. Study controls for systemic therapya
Outcome
  1. Assessment of outcome
    1. Independent blind assessmenta
    2. Record linkagea
    3. Self-report
    4. No description
  2. Was follow-up long enough for outcomes to occur?
    1. Yes (select an adequate follow-up period for outcome of interest)a
    2. No
  3. Adequacy of follow-up of cohorts
    1. Complete follow-up: all subjects accounted fora
    2. Subjects lost to follow-up unlikely to introduce bias: small number lost (<5%) or description provided of those losta
    3. Follow-up rate < 5% or no description of those lost, or both
    4. No statement
_____ /4 +_____/2 +_____/3 =_____/9 TOTAL SCORE
a

1 point.