Three assimilation variables are also tested in our analysis: temporal duration, age at migration, and acculturation.
Nevertheless, CROM was not correlated to headache intensity, frequency or duration, age or gender within the CTTH group.
Pain duration, age, and pain severity differed among the groups and were entered as covariates in hierarchical regression analyses designed to identify predictors of adjustment and pain coping.
To evaluate the associations between breastfeeding duration, age at solids introduction, and their interaction in relation to infant (age 9-15 months) above normal body mass index (BMI).
Finally, the following variables are interacted with log duration: age, education, skill, unemployment insurance (linear and quadratic), unemployment assistance, employment growth, national unemployment rate, and industry.
The variables significantly associated with migraine from the univariable analyses were sleep duration age 7 and self-completed SDQ total difficulties score at age 11.
We also recorded in depth the clinical characteristics of headaches, including precipitants, localization, quality, duration, age at onset, associated symptoms, and effects of treatments.
Lastly, age at migraine onset reported at baseline and migraine duration (age at baseline minus reported age at migraine onset) were included as disease duration covariates.
We extracted data on the diagnostic accuracy of the studies, the baseline characteristics of studied patients (e.g., disease duration, age at imaging, Hoehn and Yahr score, and Unified Parkinson's Disease Rating Scale score).
Exclusion criteria were trauma within 7 days, chronic headache defined as > 3 months duration, age < 18 years, missing informed consent, and inability to comply with study procedures due to insufficient knowledge of the German language.
Table 1 summarizes the pain etiology, duration, age at onset, and subject gender.
