Study Langeveld (1998): study NL 1992 /1

Public:

12-18 aged, chronic headache patients, The Netherlands, 199?

Sample:

Respondents:

N = 64

Non Response:

50%

Assessment:

Multiple methods
Questionnaire and diary

Correlate

Authors's label

Headache

Our Classification

Operationalization

0: no-migraine headache
1: migraine

Observed Relation with Happiness