A 1-1 matched case-control study was conducted among office workers on the association between suffering chronic lower back pain and sitting at a PC. There were 118 cases (suffering from back pain), individually matched to controls (not suffering from back pain) on sex, age, and general exercise habits. The exposure was the amount of time spent at a PC. The data are in Table 1: Case > 4 hours/day <4 hours/day Table 1 Controls > 4 hours/day 18 13 <4 hours/day 25 62
A 1-1 matched case-control study was conducted among office workers on the association between suffering chronic lower back pain and sitting at a PC. There were 118 cases (suffering from back pain), individually matched to controls (not suffering from back pain) on sex, age, and general exercise habits. The exposure was the amount of time spent at a PC. The data are in Table 1: Case > 4 hours/day <4 hours/day Table 1 Controls > 4 hours/day 18 13 <4 hours/day 25 62
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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
Transcribed Image Text:A 1-1 matched case-control study was conducted among office workers on the association between
suffering chronic lower back pain and sitting at a PC. There were 118 cases (suffering from back
pain), individually matched to controls (not suffering from back pain) on sex, age, and general
exercise habits. The exposure was the amount of time spent at a PC. The data are in Table 1:
Case
> 4 hours/day
<4 hours/day
Table 1
Controls
> 4 hours/day
18
13
<4 hours/day
25
62
Use a suitable test to test for no association between suffering chronic lower back pain and
time spent sitting at a PC.
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