Headache prevalence and characteristics among adolescents in the general population: a comparison between retrospect questionnaire and prospective paper diary data

Table 3 Spearman rho correlations for questionnaire and 3-week diary data on headache severity, frequency, intensity, duration levels and current headaches as reported by adolescents in questionnaire and paper diary

	Questionnaire					Diary
Measure	Severity^a(scale 1-4)	Frequency (scale 1-5)	Intensity^b(scale 1-3)	Duration (scale 1-6)	Current headache (VAS 0-10)	Severity/^aepisode (scale 1-5)	Number of headache days/mo (scale 0-30)	Duration/episode (scale 1-4)
Severity^a	——
Frequency	−0.31***	——
Intensity^b	0.51***	−0.10	——
Duration	0.35***	0.10	0.37***	——
Current headache	0.13	−0.33***	0.14	−0.06	——
Severity/e	0.32***	0.09	0.24*’	0.18**	0.04	——
Number of headache days	0.14	−0.11	0.19**	0.02	0.34***	0.00	——
Duration/e	0.20*	0.02	0.24**	0.31***	0.12	0.25***	0.38***	——

Note. *p < 0.05; **p < 0.01; ***p < 0.001. Sample size for correlations varied from 120 to 231.
^aDescriptive numeric 1-5 scale; ^bIntensity levels: Mild, Moderate and Severe. VAS: Visuo-analogue scale.

ISSN: 1129-2377