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Correlational findings

Study Langeveld (1998): study NL 1993

Public:
12-18 aged migraine patients and controls, followed 26 months, The Netherlands, 199?
Sample:
Respondents:
N = 159
Non Response:
at T0: 4%
Assessment:
Questionnaire: paper

Correlate

Authors's label
Headache vs no headache
Our Classification
Operationalization
1:  headache
1a: migraine headache
1b: no migraine headache
0:  controls

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks O-SLW-cw-sq-ol-11-a = CHANGE in Happiness O-SLW-cw-sq-ol-11-a E² = .12 p < .000 Linear Time Effect T0-T3 O-SLW-cw-sq-ol-11-a E² = .02 ns not stronger among headache patients

Happiness assessed at:
- T0: baseline
- T1: one week after Week 0 completion
- T2: two weeks after Week 0
- T3: three weeks after Week 0
- T4: 26 weeks after Week 0