Assertion: polio's incidence | /r/HasProperty | irregular
Facets:
value: very
type: DEGREE
value: from year
type: TEMPORAL
value: from area
type: LOCATION
Source sentences:
text: However, the incidence of the disease in the United States during the epidemic years was very irregular, not only from year to year, but from area to area, apparently showing no relation to improvements in sewage treatment.