Skip to main content

Table 1 Baseline characteristics of the cohort, by hypertension in pregnancy (n = 220)

From: Pre-pregnancy predictors of hypertension in pregnancy among Aboriginal and Torres Strait Islander women in north Queensland, Australia; a prospective cohort study

Pre-pregnancy characteristic No hypertension during pregnancy (n = 198) Hypertension during pregnancy (n = 22)   
  n % of n or mean (sd) n % of n or mean (sd) Unadjusted PR (95% CI) p value
Indigenous group       
Aboriginal 112 56.6 16 72.7 1.00  
Torres Strait Islandera 86 43.4 6 27.3 0.52 (0.21-1.28) 0.157
Age years (mean, sd) 198 23.9 (5.4) 22 23.7 (6) 0.99 (0.92-1.07) 0.914
Waist circumference (cm)       
< 80 65 33 5 22.7 1.00  
80-87.9 40 20.3 2 9.1 0.67 (0.13-3.30) 0.619
≥ 88 92 46.7 15 68.2 1.96 (0.74-5.17) 0.372
Waist circumference (mean, sd) 197 88.7 (15.8) 22 95.4 (17.6) 1.02 (1.00-1.04) 0.054
BMI category (kg/m2)       
< 18.5 23 11.6 0 0   
18.5-25 74 37.4 7 31.8 1.00  
25-30 48 24.2 6 27.3 1.29 (0.46-3.63) 0.635
≥ 30+ 53 26.7 9 40.9 1.68 (0.66-4.26) 0.276
BMI (mean, sd) 198 26.1(7) 22 29 (6.5) 1.05 (1.00-1.09) 0.033
Smoker       
No 57 28.9 8 36.4 1.00  
Yes 140 71.1 14 63.6 0.74 (0.33-3.68) 0.469
Alcohol use       
Safe drinker 56 28.9 4 18.2 1.00  
Non drinker 64 33 7 31.8 1.48 (0.45-4.82) 0.517
Risky drinker 74 38.1 11 50 1.94 (0.65-5.82) 0.236
Enough physical activity       
No 160 80.8 17 77.3 1.00  
Yes 38 19.2 5 22.7 1.23 (0.47-3.11) 0.691
Systolic blood pressure (mmHg)       
≤ 120 142 72.1 8 36.4 1.00  
> 120 55 27.9 14 63.6 3.80 (1.67-8.67) 0.001
Diastolic blood pressure (mmHg)       
≤ 80 190 96.5 19 86.4 1.00  
> 80 7 3.5 3 13.6 3.30 (1.16-9.35) 0.025
Cholesterol (mg/dL)       
≤ 5.5 176 90.3 20 90.9 1.00  
> 5.5 (elevated) 19 9.7 2 9.1 0.93 (0.23-3.73) 0.922
Triglycerides (mmol/L)       
≤ 2 173 89.6 19 86.4 1.00  
> 2 (elevated) 20 10.4 3 13.6 1.31 (0.42-4.12) 0.635
HDL cholesterol (mmol/L)       
> 1 108 56.5 9 40.9 1.00  
≤ 1 (low) 83 43.5 13 59.1 1.76 (0.78-3.95) 0.170
Red cell folate (nmol/L)       
≥ 295 126 65 17 77.3 1.00  
< 295 (low) 68 35 5 22.7 0.58 (0.22-1.50) 0.260
Fasting glucose (mmol/L)       
≤ 5.5 182 93.3 20 90.9 1.00  
> 5.5 13 6.7 2 9.1 1.35 (0.35-5.24) 0.668
Albumin:creatinine ratio (mg/mmol)       
≤ 3.4 121 82.3 13 68.4 1.00  
>3.4 26 17.7 6 31.6 2.25 (0.39-13.05) 0.366
Gamma-glutamyl transferase (U/L)       
≤ 50 183 93.9 20 90.9 1.00  
> 50 (elevated) 12 6.1 2 9.1 1.45 (0.37-5.60) 0.590
Metabolic syndromeb       
No 153 80.1 12 57.1 1.00  
Yes 38 19.9 9 42.9 2.63 (1.18-5.88) 0.018
  1. Denominators vary because of missing values.
  2. aWomen in this group self-identified as Torres Strait Islander or, as both Torres Strait Islander and Aboriginal origin.
  3. bDefined by International Diabetes Federation criteria as comprising waist circumference ≥ 80 cm plus two or more of the following: raised triglycerides (≥ 1.7 mmol/L), reduced high-density lipoprotein (< 1.29 mmol/L), raised blood pressure (systolic ≥ 130 mm Hg or diastolic ≥ 85 mm Hg) and raised plasma glucose (≥ 5.6 mmol/L). Women with diabetes excluded.