OAT Scientific Reading Comprehension 3

Question 1

A passage describes a cohort study following 500 optometry students over 10 years to track myopia progression. The key feature that distinguishes a cohort study from a case-control study is:

Accepted Answer

Participants are selected based on exposure status and followed forward in time for outcomes

Answer

Cohort studies select based on exposure and follow subjects prospectively, whereas case-control studies start with disease status and look backward.

Question 2

A table in a passage shows mean visual acuity values with standard deviations for four age groups. The standard deviation is best interpreted as:

Accepted Answer

A measure of spread indicating how much individual values vary around the mean

Answer

Standard deviation quantifies variability of individual data points around the group mean.

Question 3

A passage introduces a newly coined term 'photoreceptor fatigue index' and defines it in the first paragraph. In subsequent paragraphs, when the author uses this term, the reader should:

Accepted Answer

Apply the specific definition provided in the passage, not outside knowledge

Answer

When a passage defines a technical term, that definition governs its use throughout the passage, regardless of external knowledge.

Question 4

A passage reports: 'Treatment A reduced cup-to-disc ratio by 0.05, while Treatment B reduced it by 0.04 (p = 0.12 for comparison).' The most accurate conclusion is:

Accepted Answer

The difference between treatments A and B is not statistically significant

Answer

p = 0.12 exceeds the conventional α = 0.05 threshold, meaning the observed difference could plausibly occur by chance.

Question 5

In a passage discussing corneal topography research, the authors state their findings 'may not generalize to pediatric populations.' This caveat addresses which aspect of the study?

Accepted Answer

External validity (generalizability)

Answer

External validity concerns whether results can be generalized to populations beyond the study sample.

OAT - Optometry Admission Test Practice Test

OAT - Optometry Admission Test Practice Test

OAT Scientific Reading Comprehension 3