Table 2

Albumin-to-creatine ratio (ACR) by headache status and selection criterium

	Crude		Model I‡		Model II§
	Mean ACR (95% CI) N	p Value	Mean ACR (95% CI) N	p Value	Mean ACR (95% CI) N	p Value
Morbid sample		0.013*		0.13*		0.11*
No headache	2.03 (1.92 to 2.14) 3998		1.96 (1.85 to 2.07) 3998		1.96 (1.85 to 2.06) 3978
Non-migraine headache	1.95 (1.68 to 2.23) 591	0.61†	2.26 (1.97 to 2.54) 591	0.057†	2.27 (1.99 to 2.55) 585	0.044†
Migraine	1.22 (0.68 to 1.75) 159	0.003†	1.85 (1.31 to 2.40) 159	0.70†	1.87 (1.33 to 2.41) 158	0.75†
Random sample		0.011*		0.60*		0.55*
No headache	1.22 (1.11 to 1.32) 1289		1.16 (1.06 to 1.27) 1289		1.16 (1.05 to 1.26) 1285
Non-migraine headache	0.96 (0.77 to 1.14) 418	0.017†	1.08 (0.89 to 1.26) 418	0.44†	1.07 (0.89 to 1.26) 417	0.44†
Migraine	0.85 (0.53 to 1.16) 144	0.028†	1.02 (0.70 to 1.34) 144	0.41†	1.00 (0.68 to 1.31) 143	0.35†

*p Value for overall effect of headache groups.
†p Values are for comparison against no headache group within the same selection criterium.
‡Model I: adjusted for age and sex.
§Model II: adjusted for age, sex, self-reported diabetes and self-reported use of antihypertensive medication.