Boost PC performance: How more available memory can improve productivity
Hormones Immune
1. Controversies and Current Research The immune system in menopause and infertility Northside Hospital WomenFirst February 26, 2002 Mark Perloe, M.D., mpmd@ivf.com www.ivf.com
Assignment of individuals is randomized RCT: Individuals similar at the beginning RCOT: Prospective analytical, susceptible to bias if carry over effects occur Observational: allocation or assignement is not under investigator control; weaker potential evidence; potential for large confounding variables Cohort: prospective, follow-up period to determine effect of exposure and outcome, stronger than case-control but more expensive Case-Control: retrospective, secondary data from chart review, useful for rare conditions, inexpensive, many forms of bias Cross-Sectional: descriptive study of relationship between factors at one point in time Case-Series: series of cases, lack of comparability, source of hypothesis, most common study type Case-Report: anecdotal evidence,