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3The summer half of the year is defined as the months April September for the Northern Hemisphere and October March for the Southern Hemisphere.
The tropical year is defined as the interval between successive passages of the Sun through the vernal equinox (i.e., when it crosses the celestial equator late in March) and amounts to 365.242199 mean solar days.
Finally, the active (non-active) year is defined as a year in which the number of the active days is larger (smaller) than a half of the standard deviation from the 33-year mean.
Any family of four earning $23,550 or less per year is defined as impoverished, according to the Census Bureau.
A pack year is defined as smoking 20 cigarettes (1 pack) per day for 1 year.
One pack year is defined as 20 cigarettes smoked per day for 1 year.
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Respondents identified in the highest decile of GP use in a year were defined as Frequent Attenders (FAs).
A diagnostic delay exceeding one year was defined as late diagnosis.
For this study, an epidemic year was defined as when the number of NoV outbreaks during the 12-month period was ≥2 times higher than the numbers of outbreaks in the period before and after the observation period.
Year was defined as the calendar year of birth, 1990 to 2002, inclusive.
An epidemiological year was defined as May 1st to April 30th of the following year.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com