The average salary is 24,000, but most people earn less. Most people have an above average number of feet. In his fourth lesson of a weekly series, author Michael Blastland cracks the myth of the average.ith incomes, to take another example, many people are aware that the average in the UK (also known as the mean) is about 24,000 a year (in fact, about 463 a week).
Unlike a colonoscopy, however, the 'range' of a sigmoidoscopy is not as good; whilst a colonoscopy can visualise the entire large bowel, a sigmoidoscopy can only visualise as far as the sigmoid colon (it is therefore primarily used to visualise the rectum and parts of the sigmoid colon).nlike a colonoscopy, however, the 'range' of a sigmoidoscopy is not as good; whilst a colonoscopy can visualise the entire large bowel, a sigmoidoscopy can only visualise as far as the sigmoid colon (it is therefore primarily used to visualise the rectum and parts of the sigmoid colon).
A sigmoidoscopy is a minimally invasive procedure in which a slim tube with a camera is inserted into the rectum to examine the last part of the colon called the âsigmoid colonâ. A colonoscopy is a similar procedure to sigmoidoscopy but involves an examination of all of the colon and rectum.oth procedures are performed to detect signs of cancer or conditions such as Crohnâsdisease or ulcerative colitis. A colorectal surgeon carries out a wide range of surgeries which include: 1  Removing pre-cancerous polyps from the colon. 2  Treatment of colon cancer. 3  Colostomy.