| 41. | In observational studies, decrease in cleaning frequency turned out to be correlated to increase in cleaning durations.
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| 42. | Given that these are observational studies, caution must be given to the possibility of confounding by indication.
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| 43. | His main research field is the observational study and theoretical modelling of the dust environment in comets.
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| 44. | This approach is sometimes used in observational studies to reduce or eliminate the effects of confounding factors.
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| 45. | A general limitation of observational studies is that the relative influences of genes and environment are confounded.
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| 46. | Observational studies have suggested many health benefits from hormone replacement, but more recent controlled trials have disagreed.
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| 47. | Small randomized studies, Peto said, concluded that vitamin E protected against heart disease, as did large observational studies.
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| 48. | In observational studies smoking cessation has benefits in depression as large as or larger than those of medications.
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| 49. | This review included two trials and two observational studies with almost eleven thousand HIV infected children and adolescents.
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| 50. | Yet the link between designed urban space and human mind appears to be observational study and historical record.
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