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Table 1 Characteristics of 242 young-adult women in the Richmond, CA cohort of the NHLBI Growth and Health Study, 1996–1997.

From: Vitamin C in plasma is inversely related to blood pressure and change in blood pressure during the previous year in young Black and White women

 

All

(n = 242)

Blacks

(n = 155)

Whites

(n = 87)

 
 

Mean

SD

Mean

SD

Mean

SD

p*

Systolic BP (mmHg)

109.8

10.3

111.1

10.8

107.4

9.0

0.007

Diastolic BP (mmHg)

66.9

9.0

67.4

9.0

66.1

9.0

0.31

Plasma vitamin C (mg/dL)†

1.2

0.5

1.2

0.4

1.2

0.6

0.34

Age (yr)

19.1

0.6

19.2

0.7

19.1

0.6

0.28

Weight (kg)

70.9

19.3

71.2

19.3

70.4

19.3

0.74

BMI (kg/m2)

26.1

6.7

26.4

6.6

25.7

6.9

0.40

Television or video watching (hr/wk)

32.0

24.1

39.3

23.9

19.0

18.4

< 0.0001

Household income ($)‡

20,000–29,999

 

10,000–19,999

 

30,000–39,999

 

< 0.0001

Total energy intake (kcal/d)

1919.6

787.2

1985.8

827.7

1809.9

706.4

0.11

Total fat intake (gm/d)

74.1

36.8

79.3

36.2

65.5

36.2

0.006

Dietary vitamin C intake (mg/d)**

Mean (median, 25th75th%ile)

121.7

(79.3)

176.6

(38.9, 128.2)

128.1

(80.0)

203.4

(43.4, 126.1)

111.1

(63.5)

120.3

(31.0, 136.5)

0.43

  1. * P-values pertain to comparison between Blacks and Whites.
  2. † Multiply by 56.8 to convert to SI units, μmol/L
  3. ‡ Household income values are the categories in which the median fell.
  4. ** Values in parentheses represent median (in the Means column) and 25th/75th percentiles (in the Standard Deviations column)