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how can I determine if there is a significant difference in 3 groups of 2 varibles?


3 different intensive care units
ICU 1 had 437 patients and 59 recieved an intervention
ICU 2       222                    77
ICU 3       762                    91
 
is there a difference in rate of use of the intervention among these ICUs?

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In order to find the difference of the variables I first subtracted the number of patients from the patients that were intervened
 
  1.  ICU1->  437-59=378
  2. ICU2-> 222-77= 145
  3. ICU3 -> 762-91=671
 
Next, I subtracted the ICU difference to each unit 
1. ICU1 (378) - ICU2 (145) = Was a difference of 233
2. ICU1 (378)- ICU3 (671)= 293
3. ICU3 (671) - ICU2 (145)= 526
 I then subtracted the difference from each unit by the other units to get the remaining answers.
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1 Answer

Hi-- the question is a little vague; seems to be a math question more than nursing.  If you are seeking to compare the frequency with which each ICU used an intervention, percentage of total is one way to do that, and fits with this questions's given information.  So:
1. 437:100% as 59:x %
    Cross multiply this equation as follows:  5900/437 = 13%.
2. 222:100% as 77:x %
    Cross multiply as follows:  7700/222 = 34%
3. 762:100% as 91:x %
     Again, cross multiply as follows:  9100/762 = 11.9 or 12%.
 
Therefore, the answer is yes; there is a difference in the rate of intervention among these ICUs.  1) used the intervention 13% of the time; 2), 34% of the time, and 3), 12% of the time.  Hope this helps!