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