Table 3.

Effect of Dietary Sodium on Headache Status by Sex^† (Respondents Who Did Not Use Chronic Analgesics or Prescription Analgesics in Past Month, NHANES 1999–2004)

	Men (N = 4268)			Women (N = 4551)
Exposure category	Odds ratio	(95% CI)	P trend	Odds ratio	(95% CI)	P trend
Dietary sodium residuals
1st quartile	1.00	—	.24	1.00	—	.049
2nd quartile	0.92	(0.73, 1.14)		0.93	(0.76, 1.13)
3rd quartile	0.92	(0.69, 1.22)		0.82	(0.65, 1.04)
4th quartile	0.80	(0.57, 1.13)		0.81	(0.65, 1.00)

†Adjusted for age and BMI.