Hi,
We are comparing the clinical characteristics of infants who received Octreotide for chylothorax versus those who did not. I used Wilcoxan ranksum test to compare the duration of ventilation between the two groups because the data was not normally distributed. The median duration in the Octreotide group was 631 hours (Q1 287 and Q3 724). It was 223 hours (Q1 64 and Q3 364 hours).
i would be grateful for your help in interpreting the stata output for this. Which p value we need to use?. Prob > |z| = 0.1200 OR Exact Prob = 0.1246

ranksum duration_of_ventilation, by(octreotide_used)

Two-sample Wilcoxon rank-sum (Mann-Whitney) test

octreotide~d | obs rank sum expected
-------------+---------------------------------
0 | 25 388 425
1 | 8 173 136
-------------+---------------------------------
combined | 33 561 561

unadjusted variance 566.67
adjustment for ties -0.19
----------
adjusted variance 566.48

Ho: durat~on(octreo~d==0) = durat~on(octreo~d==1)
z = -1.555
Prob > |z| = 0.1200
Exact Prob = 0.1246