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Table 1 Assessment of the case–control and cohort study quality

From: What is the impact of birth weight corrected for gestational age on later onset asthma: a meta-analysis

Studies Selection Comparability Outcome/Exposure Score
  1 2 3 4 5a 5b 6 7 8  
Hesselmar et al. [19] *   * * *   * * * ******
Grischkan et al. [21] * * * *     * * ******
Jaakkola and Gissler [16] * * * * *   * * * *******
Liu et al. [22] * * *   *   * * * *******
Pinto et al. [23] * * * * *    * * *******
Carter et al. [13] * * * * *   * * * *******
  1. For cohort studies, 1, representativeness of the exposure group; 2, representativeness of the non-exposed group 3, determination of exposure; 4, interesting outcome not present in the beginning; 5a, controlling the most important factor; 5b, controlling any factors; 6, determination of the outcome; 7, long follow up until the outcomes to appear; 8, integrity of the study follow-up
  2. For case–control studies, 1, appropriate case identification; 2, cases are representative; 3, appropriate source of the control group; 4, no targeted medical history in the control group; 5a, confounding of the most important factors; 5b, confounding of any factors; 6, appropriate determination of the exposure factors; 7, determination that the exposure factors are the same in both groups; 8, no response rates
  3. *The article meets this term criterion