Repeated measures - Within/Between explained

#1
Hey guys,
I'm having troubles understanding my analysis.
I have patients going through pulmonary functions test every 2 weeks in 5 different time points and I have 2 groups: smokers and non-smokers.
So I ran Repeated measures with 5 scores of tests in the within....and smoking groups in the between.
So far so good.

the time itself is not significant - the pulmonary scores did not change within time.
time*smoking in the within patients is not significant.
in the between factors: smoking is significant.

So I want to understand the different meaning of time*smoking in within - what does that mean, and what does smoking in the between ? what's the difference between them clinically?

thanks
Amir
 

rogojel

TS Contributor
#3
hi,
without seeing the output I would say that the two groups behave differently over time. In this case you should look at these differences in time behavior and you should not accept the general statement that the time has no effect (is not significan).

regards
 

Karabiner

TS Contributor
#4
the time itself is not significant - the pulmonary scores did not change within time.
time*smoking in the within patients is not significant.
in the between factors: smoking is significant.
Create a line graph, with one line connecting the 5 mean of the smokers group and one line conecting the 5 means of the nonsmokers group. If possible, you should also indicate variability (standard deviations or standard errors maybe).

With kind regards

K.