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During the 13 years between 1985 to 1998, the death rate from cancer fell by 16% in people under 75 years, suggesting that the government target may not be as tough as they claim.
But we can’t assume that a similar trend will apply to the 13 years between 1997 and 2010, because:
- the population is ageing and older people have a higher risk of cancer
- even for people of the same age, the risk of cancer may be different in different time periods

How would you try to assess whether these trends will continue?
Hint: Which cancers cause the most deaths?