Power is the probability that a study will reject the null hypothesis. difference between the null and alternative hypotheses. level of significance, and the null vs. alternative difference. a numeric example of power and sample size estimation for the one-sample case.
During the procedure the patient is unconscious and unaware of the need to urinate. After the procedure, however, it may not be safe for the patient to walk. They may be too sick to take care of their own bathroom needs or their surgeon may feel that a catheter is best for their particular recovery.
A Foley catheter is a sterile (germ-free) tube that is inserted through your urethra and into your bladder to drain urine. The catheter has a small balloon that is filled with solution to hold the catheter inside your bladder. A Foley catheter is also called an indwelling urinary catheter. You may need a catheter if: