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The
age-period model relied on the two
extreme assumptions:
1)
there was no cohort factor (no etiologic environmental factor of
exposure involved in the incidence trend) and
2)
past under-reporting in a given period was of equal importance within
the different age groups, except in 1970-79 in people aged 70 years or
older (it was assumed to be different).
The
age-period model showed that
under-reporting in 1970-79 was greater among patients aged 70 years or
older.
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