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Table 4 Differences in blood pressure for measures of blood pressure variability across quartiles of forced-expiratory-volume-in-1-second-to-forced-vital-capacity ratio

From: The association of reduced lung function with blood pressure variability in African Americans: data from the Jackson Heart Study

  Forced expiratory volume in 1 s to forced vital capacity ratio  
  Quartile 1 (lowest) Quartile 2 Quartile 3 Quartile 4 (highest) p-trend
  Day-night standard deviation
Systolic blood pressure (n = 251) (n = 253) (n = 253) (n = 251)  
Mean ± standard deviation 9.3 ± 2.6 9.2 ± 2.2 9.4 ± 2.5 9.3 ± 2.5 0.680
Model 1, β (95 % CI) 0 (ref) −0.1 (−0.5 to 0.3) 0.2 (−0.2 to 0.6) −0.1 (−0.5 to 0.4) 0.890
Model 2, β (95 % CI) 0 (ref) −0.0 (−0.5 to 0.4) 0.1 (−0.4 to 0.5) −0.1 (−0.5 to 0.4) 0.314
Diastolic blood pressure      
Mean ± standard deviation 8.1 ± 2.2 8.1 ± 2.0 8.2 ± 2.3 8.0 ± 2.1 0.685
Model 1, β (95 % CI) 0 (ref) 0.0 (−0.4 to 0.4) 0.1 (−0.3 to 0.4) −0.1 (−0.5 to 0.3) 0.688
Model 2, β (95 % CI) 0 (ref) −0.0 (−0.4 to 0.3) −0.2 (−0.6 to 0.2) −0.2 (−0.6 to 0.2) 0.180
  Average real variability
Systolic blood pressure      
Mean ± standard deviation 8.7 ± 2.2 8.6 ± 2.0 8.8 ± 2.0 8.8 ± 2.1 0.570
Model 1, β (95 % CI) 0 (ref) −0.1 (−0.5 to 0.2) 0.1 (−0.2 to 0.5) −0.0 (−0.4 to 0.3) 0.765
Model 2, β (95 % CI) 0 (ref) −0.1 (−0.5 to 0.2) 0.1 (−0.3 to 0.4) 0.0 (−0.3 to 0.4) 0.702
Diastolic blood pressure      
Mean ± standard deviation 7.6 ± 2.1 7.7 ± 2.0 7.7 ± 2.2 7.6 ± 2.1 0.888
Model 1, β (95 % CI) 0 (ref) 0.0 (−0.3 to 0.4) 0.1 (−0.2 to 0.5) 0.0 (−0.4 to 0.4) 0.878
Model 2, β (95 % CI) 0 (ref) −0.1 (−0.4 to 0.3) −0.1 (−0.5 to 0.3) −0.2 (−0.6 to 0.2) 0.297
  1. Forced expiratory volume in 1 s: Forced vital capacity ratio quartile cut points (lowest to highest quartile):
  2. Men: < 0.96, 0.96 to 1.02, 1.02 to 1.07, and ≥ 1.07
  3. Women: < 0.97, 0.97 to 1.03, 1.03 to 1.07, and ≥ 1.07
  4. CI: confidence interval
  5. Model 1: adjustment for demographics (age and sex)
  6. Model 2: Adjustment for Model 1 variables plus behaviors (cigarette smoking, physical activity, and body mass index), co-morbid conditions (diabetes, total and HDL-cholesterol and statin use, history of stroke and history of myocardial infarction), kidney function (estimated glomerular filtration rate and albuminuria), markers of inflammation (C-reactive protein), mean daytime SBP or DBP and antihypertensive medication classes being taken