Table 1

Characteristics of the baseline cross-sectional (CS) and longitudinal (L) analysis populations at baseline

Cross sectional analysis population

Longitudinal analysis population


Men

Women

Men

Women

AA

(n = 1,143)

W

(n = 1,161)

AA

(n = 1,447)

W

(n = 1,298)

AA

(n = 849)

W

(n = 812)

AA

(n = 1,409)

W

(n = 1,278)

Age *

24.2 (3.8)

25.4 (3.4)

24.4 (3.9)

25.4 (3.4)

24.0 (3.7)

25.4 (3.3)

24.3 (3.8)

25.4 (3.4)

BMI

24.5 (4.3)

24.3 (3.6)

25.8 (6.5)

23.1 (4.4)

23.8 (3.6)

23.7 (3.0)

25.7 (6.4)

23.0 (4.3)

GFR†

99.2 (17.7)

86.6 (15.0)

98.5 (19.3)

81.7 (14.9)

101.1 (17.6)

88.3 (15.1)

98.9 (19.2)

81.9 (14.8)

Hypertension‡ (%)

4.0

2.8

1.9

0.7

3.2

2.1

1.8

0.6

Antihypertensive use§¶ (%)

0.4

1.4

1.2

1.4

0

1.4

1.3

1.0

Diuretic use (%)

0.7

0.5

1.6

1.0

0.2

0.4

1.4

0.9


Cross sectional analysis population

Longitudinal analysis population


Men

Women

Men

Women

AA

(n = 1,143)

W

(n = 1,161)

AA

(n = 1,447)

W

(n = 1,298)

AA

(n = 849)

W

(n = 812)

AA

(n = 1,409)

W

(n = 1,278)

Beer intake||

2 (0 to 6.0)

2 (0 to 7.0)

0 (0 to 0)

0 (0 to 2.0)

1 (0 to 6.0)

2 (0 to 6.0)

0 (0 to 0)

0 (0 to 2.0)

Liquor intake||

0 (0 to 0)

0 (0 to 1.0)

0 (0 to 0)

0 (0 to 2.0)

0 (0 to 0)

0 (0 to 1.0)

0 (0 to 0)

0 (0 to 2.0)

Wine intake||

0 (0 to 0)

0 (0 to 1.0)

0 (0 to 0)

0 (0 to 2.0)

0 (0 to 0)

0 (0 to 1.0)

0 (0 to 0)

0 (0 to 2.0)

Meat intake ¶

6.4 (4.9)

3.9 (2.7)

3.8 (2.8)

2.0 (1.6)

6.3 (5.0)

3.7 (2.6)

3.7 (2.7)

2.0 (1.6)

Seafood intake¶

0.8 (1.2)

0.6 (0.8)

0.6 (1.1)

0.5 (0.6)

0.7 (1.2)

0.6 (0.8)

0.6 (1.1)

0.5 (0.6)

Dairy intake¶

6.1 (7.1)

5.8 (5.0)

3.7 (3.8)

4.1 (3.1)

6.1 (6.1)

6.0 (5.0)

3.7 (3.8)

4.1 (3.1)

Protein intake**

144 (88)

126 (56)

91 (49)

81 (33)

145 (92)

125 (55)

91 (49)

81 (34)


AA, African-American; W, White; BMI, body-mass index in kilograms per square meter; GFR, glomerular filtration rate *All values expressed as mean (standard deviation) unless noted. † In milliliters per minute. Values obtained using the Modification of Diet in Renal Disease (MDRD) equation [20]. ‡ Defined as a systolic blood pressure ≥ 140 or a diastolic blood pressure ≥ 90 millimeters of mercury. § Excluding diuretics.|| Alcohol intake values expressed as median (inter-quartile range) given skewed distribution of data points. Measured in servings/week, where one serving of beer is equal to a 12-ounce bottle, one serving of liquor is equal to a 1.5-ounce shot, and one serving of wine is equal to a 5-ounce glass

¶ Reported as servings/day (meat, seafood, dairy) or grams/day (protein). One meat or seafood serving is equal to one ounce. One serving of diary varies according to the composition: for milk a serving is equal to one cup or eight fluid ounces. For cheese a serving is two ounces for processed, two cups for cottage and three cups for dry curd. For yogurt is it is one cup and for ice cream it is one-half cup. ** In grams per day.

Gaffo et al. Arthritis Research & Therapy 2012 14:R4   doi:10.1186/ar3552

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