| 1. | Tinbergen based his ideas on his methods of observational study of birds.
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| 2. | The same observational study estimated that 78 % of litterers are male.
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| 3. | Observational studies of systemic hormone replacement after breast cancer are generally reassuring.
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| 4. | In the 70-month CIRCLE observational study, pitavastatin increased HDL more than atorvastatin.
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| 5. | The observational study involved a mix of 38, 077 male health professionals.
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| 6. | The design of an experiment or observational study often influences the power.
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| 7. | Observational studies of systemic hormone replacement therapy after breast cancer are generally reassuring.
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| 8. | A draft checklist for reporting observational studies in conference abstracts is also available.
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| 9. | Among his contributions to his scientific field, were observational studies within eye movement.
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| 10. | Observational studies are of two main types : case-control studies and cohort studies.
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