In a Cross-Sectional Study, a Difference Among Groups of Different

question 9

Multiple Choice

In a cross-sectional study, a difference among groups of different ages may reflect developmental age changes; however, these differences may result from _____ effects.

• A)regression
• B)nonequivalent
• C)propensity
• D)cohort

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Definitions:

Blastocyst

An early stage in the embryonic development of mammals, consisting of a sphere made up of an outer layer of cells and a fluid-filled cavity.

Placenta

The placenta is an organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the fetus while removing waste products.

Teratogens

Agents, such as chemicals or viruses, that can reach the embryo or fetus during prenatal development and cause harm.

Diethylstilbestrol

A synthetic estrogen that was prescribed to pregnant women to prevent miscarriages and premature labor, later found to cause significant health issues.