If yes, frequency of discrepancy ii.
Probable MOH was assumed to be the diagnosis when headache frequency was ≥15 d/mo, duration was >4 h, the question "Do you usually take medication to treat your headaches" was answered "yes", and frequency of acute medication use was ≥15 d/mo if the medication was simple analgesics only and ≥10 d/mo if any other (compound analgesics, opioids, triptans and/or ergots).
The response categories were also made dichotomous (yes/no), such that the subject would be asked whether they had any of the twelve depressive symptoms and, if yes, their frequency, during the last two weeks.
However, if the answer was "yes", the frequency and severity of this difficulty had to be assessed.
The trained interviewers asked the participants whether or not they suffered with heartburn or acid regurgitation in the past 12 months, and if yes, the frequency of the symptoms, and the age the symptoms started.
These included ethnicity (96.2% white), whether children always had to tell their parents where they were going (93.3% yes), the frequency that parents allowed their child to play out after dark (91.3% never/rarely) and whether or not the child had a garden, television or computer at home (98.7, 99.5 and 96.2% yes, respectively).
If center = yes, zero frequency will appear at the center of the FFT images.
The drug use variables included current injecting (yes or no), frequency of injecting, main type of drug injected, time elapsed since start of injecting drug use, frequency of non-injecting drug use and type of drug used mainly as non-injecting drug.
Hence, GO terms whose value "yes" has a frequency of occurrence smaller than a predefined threshold - the "GO term occurrence threshold" - are removed from the dataset.
We dichotomized the variable of Chinese herbal medicine use to "no" and "yes" by the frequency of 1 time/month (Table 2).
