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

TABLE B.II.

Scoring form for case–control studies

B.2.

Selection
  1. Is the case definition adequate?
    1. Yes, with independent validationa
    2. Yes (for example, record linkage or based on self-report)
    3. No description
  2. Representativeness of the cases
    1. Consecutive or obviously representative series of casesa
    2. Potential for selection biases or not stated
  3. Selection of controls
    1. Community controlsa
    2. Hospital controls
    3. No description
  4. Definition of controls
    1. No history of disease (endpoint)a
    2. No description of source
Comparability
  1. Comparability of cases and controls based on the design or analysis
    1. Study controls for symptomsa
    2. Study controls for systemic therapya
Exposure
  1. Ascertainment of exposure
    1. Secure recorda
    2. Structured interview with blinding to case or control statusa
    3. Written self-report or medical record only
    4. No description
  2. Same method of ascertainment for cases and controls
    1. Yesa
    2. No
  3. Nonresponse rate
    1. Same rate for both groupsa
    2. Non-respondents described
    3. Rate different and no designation
_____/4 +_____/2 +_____/3 =_____/9 TOTAL SCORE
a

1 point.