TABLE 2—
HR (95% CI) of Headaches by Level of Urinary Sodium Excretion During Follow-Up: Trial of Nonpharmacologic Interventions in the Elderly, United States, 1992–1995
| Average Urinary Sodium as Categorical Variableb |
|||
| Model | Average Urinary Sodium Excretion as a Continuous Variable,a HR (95% CI) | 120–150 mmol/24 h, HR (95% CI) | > 150 mmol/24 h, HR (95% CI) |
| Model 1c | 1.04 (1.00, 1.07) | 1.01 (0.62, 1.66) | 1.65 (1.11, 2.46) |
| Model 2d | 1.07 (1.04, 1.11) | 1.15 (0.67, 1.95) | 2.27 (1.45, 3.55) |
| Model 3e | 1.07 (1.04, 1.11) | 1.26 (0.74, 2.16) | 2.32 (1.48, 3.65) |
Note. CI = confidence interval; HR = hazard ratio. Cox proportional hazard models showing HR of headaches associated with average urinary sodium excretion.
a
Higher by 10 mmol/24 h.
b
< 120 mmol/24 h is the reference group.
c
Cox proportional hazards models adjusted for clinical center.
d
Model 1 plus smoking, race, gender, age, alcohol use, baseline headache, average weight loss during follow-up, physical activity and time-varying drug withdrawal status.
e
Model 2 plus most recent systolic blood pressure and diastolic blood pressure before the occurrence of headaches.