Meta-analysis

A statistical method of combining the results of a number of different studies in order to provide a larger sample size for evaluation and to produce a stronger conclusion than can be provided by any single study.

Source: GreenFacts

Meta-analyses are attempted when previous studies were too small individually to achieve meaningful or statistically significant results. Because combining data from disparate groups is problematic, meta-analyses usually are considered more suggestive than definitive.

Source: GreenFacts

Epidemiological studies

Tobacco

Endocrine disruptors risks

Pesticides occupational risks

Aspirin & Cancer