| 11. | The observational studies do not rule out other factors like genetics and diet.
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| 12. | This keeps the whole data collection process of the observational study entirely unobtrusive.
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| 13. | An Observational Study of Five Psychiatry Journals That Mandate Prospective Clinical Trial Registration
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| 14. | However, these findings were identified on the basis of epidemiologic observational studies alone.
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| 15. | Two meta-analyses of observational studies in sub-Saharan Africa were published in January 2015.
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| 16. | Hawk noted that this was an observational study, not a randomized, controlled trial.
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| 17. | Paired " t "-tests are a form of confounding factors in an observational study.
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| 18. | The problem, says Love, is the data come from observational studies, not random ones.
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| 19. | A few more recent reviews have also studied the results of non-randomized, observational studies.
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| 20. | Confounding by indication has been described as the most important limitation of observational studies.
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