OCS Field Guide Podcast

Question 1

What does the Effect Size mean?

Answer 1

How meaningful the relationship between variables or the difference between groups is

Question 2

What is a “medium” effect size?

Answer 2

0.5-0.8

Question 3

What is a “large” effect size?

Answer 3

> 0.8

Question 4

What is a “small” effect size?

Answer 4

0.2-0.5

Question 5

What is Cohen’s kappa?

Answer 5

The difference between the observed overall accuracy of the model and the overall accuracy that can be obtained by chance

Question 6

What is a “no better/less than chance” of Cohen’s Kappa?

Answer 6

<0

Question 7

What is “slight agreement” with Cohen’s Kappa?

Answer 7

0.01-0.2

Question 8

What is “fair agreement” with Cohen’s Kappa?

Answer 8

0.21-0.4

Question 9

What is “Moderate agreement” with Cohen’s Kappa?

Answer 9

0.41-0.6

Question 10

What is “Substantial agreement” with Cohen’s Kappa?

Answer 10

0.61-0.8

Question 11

What is “Almost perfect agreement” with Cohen’s Kappa?

Answer 11

0.81-0.99

Question 12

What are the levels of agreement for Cohen’s Kappa?

Answer 12

Less than chance
Slight
Fair
Moderate
Substantial
Almost perfect

Question 13

What is the symbol for Cohen’s Kappa?

Answer 13

Greek small letter K noted as:

κ

Question 14

What is the MCID for the ODI?

Answer 14

10

Question 15

What is the biggest factor to address low back pain?

Answer 15

Psychosocial factors

Question 16

What is low back pain correlated with?

Answer 16

Previous episode of low back pain
Overweight - sciatica in particular

Question 17

What is low back pain not correlated with?

Answer 17

Image findings

Inconclusive on back strength and mobility

Question 18

What is the John Henry effect?

Answer 18

A scenario where participants of a survey feel they are disadvantaged, so they try harder than they otherwise would to compensate (like John Henry against the machine)

Question 19

How to correct for the John Henry effect?

Answer 19

Blind the participants to the other interventions

Question 20

What is the Pygmalion effect? (Also called Rosenthal)

Answer 20

The tendency of the researchers to influence the results due to their bias and how they talk to participants

Question 21

How do correct for the Pygmalion effect?

Answer 21

Blind the researchers to the interventions

Question 22

What are the different effects or errors that can arise from research?

Answer 22

-Placebo effect
-Nocebo effect
-Hawthorne effect
-John Henry effect
-Pygmalion effect

Question 23

What is the Hawthorne effect?

Answer 23

When people perform differently because they are being watched