Table 1 Selected characteristics of overall weighted study population 2986 US adults aged 19 and older with hypertension, NHANES 1991–1994a,b

From: Red blood cell folate and cardiovascular deaths among hypertensive adults, an 18-year follow-up of a national cohort

Characteristica

Level

Unweighted sample size

%(SE)

Year of follow-up, mean (year)

 

2986

11.66 (0.03)

Age at the interview, mean (year)

 

2986

55.19 (0.11)

Serum folate, mean (ng/mL)

 

2986

8.22 (0.05)

(nmol/L)

 

2986

18.62 (0.10)

RBC folate, mean (ng/mL)

 

2986

221.9 (0.92)

(nmol/L)

 

2986

502.9 (2.09)

Gender

Men

1312

48.54 (0.27)

Family income levelc

Poor

760

13.82 (0.07)

 

Near poor

912

24.13 (0.33)

 

Middle income

834

35.58 (0.71)

 

High income

480

26.47 (0.71)

Race and ethnicity

Whites

1369

76.52 (0.48)

 

Blacks

916

13.26 (0.18)

 

Mexican Americans

599

3.89 (0.16)

 

Others

102

6.33 (0.33)

Alcohol drinking

Rare/never

2711

88.76 (0.30)

 

Light/moderate

240

9.86 (0.32)

 

Heavy

35

1.38 (0.02)

Cigarette smoking

Rare/never,current

1466

42.74 (0.46)

 

Light/moderate, current

342

9.86 (0.36)

 

Heavy, current

251

12.16 (0.19)

 

Former

927

35.24 (0.67)

Level of body mass index

Underweight

44

1.38 (0.04)

 

Healthy weight

752

25.98 (0.26)

 

Overweight

1104

35.98 (0.40)

 

Obese

1082

37.66 (0.31)

Vitamin B12 supplementation

Yes

776

30.06 (0.43)

  1. SE standard error, NHANES the National Health Examination and Nutrition Survey, RBC Red blood cell
  2. aThe characteristics were measured at baseline conducted between the year 1991 and 1994
  3. bPresented as percentage (standard error) unless otherwise specified. The n was presented as unweight but the % and its standard error were weighted
  4. cRespondents were categorized based on Poverty Index Ratio (PIR), poor was defined as PIR < 1.0; near poor as 1≤ PIR < 2, middle-income as 2 ≤ PIR < 4, and high-income as PIR ≥ 4
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