It should be clear whether diagnoses were mutually exclusive or, alternatively, one person could be diagnosed with multiple headache types (or subtypes).
It has been well-known that there is overlap in symptomatology between headache subtypes and multiple headache types often coexist in the same individual; for example great majority of migraineurs also have tension type headache (TTH) creating diagnostic confusion for many studies [7].
Significant correlated IQ score variables and selected clinical and anamnestic variables were then included in a stepwise linear multiple regression model using TIQ, VIQ and PIQ separately as dependent variables and the headache subtypes, frequency of the attacks, the duration of the patient's history of headache and the age at onset as independent variables.
Stepwise linear multiple regression, investigating each of the correlated WISC-R variables (TIQ, VIQ, PIQ) separately as dependent variables and the headache subtypes, frequency of the attacks, the duration of the patient's history of headache and the age at onset as independent variables, was performed.
The diagnosis of headache subtypes in 453 patients was made by headache experts according to the ICHD-II and the likelihood ratios (LR) of clinical characteristics of migraine were calculated in Part I of the study.
Multiple headache questionnaires assessing headache impact have been described previously; however, none of the existing questionnaires have been designed to cover migraine with co-existing TTH and NP.
Headache subtypes and frequency differ considerably among elderly South East Asian patients.
Headache subtypes differed in the two age groups (Table 3).
However, diagnostic stability differed by headache subtype; probable migraine was more solid headache diagnosis than other headache subtypes, regardless of follow-up duration.
International Headache Criteria II (ICHD-II) were used to classify various headache subtypes.
