Table 2.

Geometric Means for the 24-Hour Urinary Excretion Biomarker, Uncalibrated Food Frequency Questionnaire–Based Self-Report, and Biomarker-Calibrated Self-Report, Women's Health Initiative Nutrition and Physical Activity Assessment Study, 2007–2009

Nutritional Variable and Body Mass Indexa Category	Biomarker			Uncalibrated			Calibrated
	No.b	Geometric Mean	2.5th, 97.5th Percentilec	No.b	Geometric Mean	2.5th, 97.5th Percentilec	No.b	Geometric Mean	2.5th, 97.5th Percentilec
Sodium-to-potassium ratio	398	1.21	0.45, 3.37	450	0.98	0.54, 1.69	420	1.24	0.79, 2.24
<25.0	139	0.98	0.38, 2.36	156	0.93	0.60, 1.62	145	1.04	0.76, 1.55
25.0–29.9	105	1.28	0.53, 2.83	121	1.00	0.50, 1.60	113	1.25	0.82, 2.04
≥30.0	154	1.42	0.56, 4.03	173	1.02	0.54, 1.73	162	1.45	0.98, 2.57
Total sodium, mg/day	398	2,607.9	1,137.1, 5,324.4	450	2,383.1	888.4, 5,046.9	413	2,566.6	1,898.3, 3,544.9
<25.0	139	2,324.5	1,064.7, 4,921.6	156	2,349.2	1,006.6, 4,945.7	145	2,261.1	1,781.3, 2,878.1
25.0–29.9	105	2,513.0	1,180.8, 4,828.3	121	2,345.1	728.8, 5,057.5	109	2,562.6	2,003.5, 3,200.1
≥30.0	154	2,967.4	1,244.9, 6,750.7	173	2,441.3	1,079.1, 5,049.4	159	2,884.2	2,205.3, 3,933.5
Total potassium, mg/day	403	2,138.3	974.3, 4,586.9	449	2,432.6	988.9, 4,983.6	413	2,076.6	1,452.0, 2,688.9
<25.0	140	2,364.7	1,161.3, 4,819.5	156	2,531.6	1,250.0, 4,625.8	145	2,180.2	1,632.4, 2,732.5
25.0–29.9	109	1,948.2	945.9, 3,937.8	121	2,338.2	764.7, 4,788.9	109	2,075.2	1,477.4, 2,685.1
≥30.0	154	2,084.4	870.9, 4,497.0	172	2,412.4	1,056.8, 5,197.5	159	1,987.4	1,419.6, 2,678.4

Abbreviation: BMI, body mass index.

^a Weight (kg)/height (m)².

^b Number of women without missing data.

^c Interval from the empirical 2.5 percentile to the 97.5 percentile for the nutritional variable.