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#1
09-05-2011
 USMLE Forums Master Steps History: Step 1 Only Posts: 567 Threads: 25 Thanked 524 Times in 263 Posts Reputation: 534
Study subjects and changing the working light brightness! Type of bias

Interesting comparison... Check this Bias...

A Group of works over the lab are being measure how they increase they productivity on a warehouse, the researches found that as they increase the brightness on the warehouse the workers do better job, before they conclude their analysis they did the opposite to see what was happening and measure all the workers again and try to decrease this time the light on the room, they start with a bright room and get it dimmer dimmer and dimmer ( darker ) and they measure it again, they in both way of the study found that the efficacy of the workers increase in both analysis.

What type of bias are we seem on this study ?

...
 The above post was thanked by: drnrpatel (09-05-2011)

#2
09-05-2011
 Guest Steps History: 1+CK+CS Posts: 441 Threads: 153 Thanked 396 Times in 211 Posts Reputation: 419

Quote:
 Originally Posted by rulz Interesting comparison... Check this Bias... A Group of works over the lab are being measure how they increase they productivity on a warehouse, the researches found that as they increase the brightness on the warehouse the workers do better job, before they conclude their analysis they did the opposite to see what was happening and measure all the workers again and try to decrease this time the light on the room, they start with a bright room and get it dimmer dimmer and dimmer ( darker ) and they measure it again, they in both way of the study found that the efficacy of the workers increase in both analysis. What type of bias are we seem on this study ? ...
Hawthorne due to consciousness of being studied!!!!
 The above post was thanked by: rulz (09-06-2011)
#3
09-06-2011
 USMLE Forums Master Steps History: Step 1 Only Posts: 567 Threads: 25 Thanked 524 Times in 263 Posts Reputation: 534

Exactly, You are more than right! =) I really like this question when i see it. Dr. Steven Daugherty Explain this on Biostat videos...

It is the Hawthorne, When the subject being study change their behavior owing to the knowledge of being studied.

 Tags Biostatistics-Epidemiology

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