The relationship between headache-attributed disability and lost productivity: 2. Empirical evidence from population-based studies in nine disparate countries

Table 7 Spearman correlations between headache-attributed disability¹ and total lost productivity (HALT questions 1 + 2 + 3 + 4) by headache type and country

Country	Migraine			Probable medication-overuse headache
Country	N	r_s	p	N	r_s	p
China	203	0.28	< 0.001	–	–	–
Ethiopia	479	0.28	< 0.001	23	0.34	0.12
India	372	0.25	< 0.001	27	− 0.11	0.57
Lithuania + Luxembourg	554	0.30	< 0.001	62	0.08	0.52
Nepal	674	0.11	0.004	53	0.09	0.50
Pakistan	617	0.31	< 0.001	115	−0.14	0.14
Russia	108	0.28	0.004	64	0.32	0.01
Spain	367	0.37	< 0.001	55	0.28	0.04

HALT: Headache-Attributed Lost Time questionnaire. ¹ Calculated as proportion of time in ictal state*disability weight from GBD2015 [49]; significant p-values are emboldened.

ISSN: 1129-2377