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).
Sigmoidoscopy is most commonly used to screen asymptomatic patients for precancerous changes and malignancies. Signs and symptoms such as diarrhea, proctitis and rectal pain can be evaluated by flexible sigmoidoscopy, but further examination using a barium enema or colonoscopy may be required in symptomatic patients.lexible sigmoidoscopy is an important screening procedure because of its ability to detect early changes in the distal colon.