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Table 1 Baseline characteristics of the study population according to total antioxidant capacity quartiles (RaNCD cohort data, N = 5067)

From: Association between dietary total antioxidant capacity and hypertension in Iranian Kurdish women

Variable

Dietary total antioxidant capacity (TAC)

P value*

Q1 n = 1569

Q2 n = 1295

Q3 n = 1.121

Q4 n = 1082

Mean ± SD/n (%)

TAC score

0.10 ± 0.02

0.16 ± 0.02

0.24 ± 0.03

0.46 ± 0.19

Age

49.07 ± 8.68

47.38 ± 8.28

46.99 ± 8.35

46.52 ± 8.06

 < 0.001

BMI (kg/m2)

27.69 ± 4.83

28.71 ± 4.94

28.88 ± 4.90

29.17 ± 4.69

 < 0.001

WHR

0.94 ± 0.05

0.94 ± 0.06

0.95 ± 0.06

0.95 ± 0.06

 < 0.001

Marital status

Married

1234 (78.65)

1099 (84.86)

972 (86.71)

938 (86.69)

 < 0.001

Single

139 (8.86)

67 (5.17)

66 (5.89)

50 (4.62)

 

Widowed/Divorced

196 (12.49)

129 (9.96)

83 (7.40)

94 (8.69)

 

Socio-economic status

1(lowest)

781 (49.78)

430 (33.20)

285 (25.47)

192 (17.76)

 < 0.001

2

543 (34.17)

471 (36.37)

362 (32.35)

312 (28.86)

 

3(highest)

245 (15.62)

394 (30.42)

472 (42.18)

577 (53.38)

 

Physical activity (Met-h/day)

Light

412 (26.26)

357 (27.57)

271 (24.17)

283 (26.16)

 < 0.001

Moderate

973 (62.01)

768 (59.31)

742 (66.19)

713 (65.90)

 

High

184 (11.73)

170 (13.13)

108 (9.63)

86 (7.95)

 

Menopausal status

Pre/perimenopausal

985 (62.78)

912 (70.42)

808 (72.08)

796 (73.57)

 < 0.001

Post-menopausal

584 (37.22)

383 (29.58)

313 (27.92)

286 (26.43)

 

Current smoker

37 (2.38)

21 (1.64)

25 (2.26)

15 (1.40)

0.010

Hypertension

296 (18.87)

217 (16.76)

174 (15.52)

159 (14.70)

0.023

  1. BMI Body mass index; WHR Waist hip ratio
  2. *Analysis of variance (ANOVA) and Chi square, P < 0.05