We classified participants into four mutually exclusive categories of headache: no headache once or more a month (reference category), non-migraine headache, migraine without aura, and migraine with aura.
Teaching with The Times – Peruse the newspaper over the period of a month for references to new inventions, products or ideas.
The corresponding rates recorded in the study by Sudman et al [ 12], using a combined interview and diary procedure with a 3-month reference period, were 24% and 17% respectively.
A four-month reference period was used to minimize recall bias, while capturing "usual" transfer behavior.
After all, a study in the Netherlands [ 11] was able to detect significance variations in herds' performances attributable to SBV using a 3-month reference period.
Finally, the resulting OHIP-NL, that uses a 1-month reference period (see Discussion), was read and commented upon by members of the Department of Oral Function.
John et al. [ 13] showed that a 1-month reference period yields the highest ICC values and the narrowest limits of agreement as compared to a 1-year period and lifetime experience.
In a separate analysis of our survey data we found that the proportion of women reporting having 'ever undergone hysterectomy' (instead of in a 6-month reference period) was similar between insured and uninsured women, but we did not know their insurance status at the time of the hysterectomy [ 41].
In a press conference, Mrs May referenced the petition, saying: "We didn't say, 'tell us what you think and we'll think about it'.
Recently, 18 year old Cameron D'Ambrosio went to jail for over a month for just referencing the Boston Bombings in a rap song that he posted to his Facebook page.
"This matter relates to Kurtley Beale allegedly distributing what we consider highly inappropriate and deeply offensive text messages and images to a number of people in June, referencing an ARU staff member," Pulver said.
