Skip to main content

Table 2 Differences in day-night standard deviation of blood pressure across quartiles of forced-expiratory-volume-in-1-second and forced-vital-capacity

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

  Quartile 1 (lowest) Quartile 2 Quartile 3 Quartile 4 (highest) p-trend
  Forced expiratory volume in 1 s
Systolic blood pressure (n = 251) (n = 253) (n = 253) (n = 251)  
Mean ± standard deviation 9.5 ± 2.5 9.4 ± 2.4 9.1 ± 2.3 9.3 ± 2.6 0.111
Model 1, β (95 % CI) 0 (ref) 0.0 (−0.4 to 0.4) −0.4 (−0.8 to 0.1) −0.3 (−0.7 to 0.1) 0.041
Model 2, β (95 % CI) 0 (ref) 0.1 (−0.4 to 0.5) −0.1 (−0.5 to 0.3) −0.0 (−0.4 to 0.4) 0.775
Diastolic blood pressure      
Mean ± standard deviation 8.1 ± 2.1 8.2 ± 2.1 8.1 ± 2.3 8.0 ± 2.0 0.318
Model 1, β (95 % CI) 0 (ref) 0.0 (−0.4 to 0.4) −0.1 (−0.4 to 0.3) −0.2 (−0.6 to 0.2) 0.321
Model 2, β (95 % CI) 0 (ref) −0.1 (−0.5 to 0.3) −0.1 (−0.5 to 0.3) −0.2 (−0.6 to 0.2) 0.393
  Forced vital capacity
Systolic blood pressure (n = 251) (n = 253) (n = 253) (n = 251)  
Mean ± standard deviation 9.6 ± 2.5 9.3 ± 2.5 9.1 ± 2.4 9.3 ± 2.4 0.054
Model 1, β (95 % CI) 0 (ref) −0.2 (−0.6 to 0.2) −0.5 (−0.9 to −0.1) −0.5 (−0.9 to −0.1) 0.009
Model 2, β (95 % CI) 0 (ref) −0.1 (−0.6 to 0.3) −0.3 (−0.7 to 0.2) −0.1 (−0.5 to 0.3) 0.495
Diastolic blood pressure      
Mean ± standard deviation 8.3 ± 2.1 8.1 ± 2.3 7.8 ± 2.1 8.1 ± 2.1 0.155
Model 1, β (95 % CI) 0 (ref) −0.1 (−0.5 to 0.2) −0.5 (−0.8 to −0.1) −0.2 (−0.6 to 0.2) 0.157
Model 2, β (95 % CI) 0 (ref) −0.3 (−0.7 to 0.1) −0.5 (−0.9 to −0.1) −0.1 (−0.5 to 0.3) 0.348
  1. Forced expiratory volume in 1 s quartile cut points (lowest to highest quartile):
  2. Men: < 80.7, 80.7 to 91.8, 91.8 to 101.1, and ≥ 101.1
  3. Women: < 83.8, 83.8 to 95.4, 95.4 to 106.8, and ≥ 106.8
  4. Forced vital capacity quartile cut points (lowest to highest quartile):
  5. Men: < 81.4, 81.4 to 90.4, 90.4 to 99.8, and ≥ 99.8
  6. Women: < 83.3, 83.3 to 94.2, 94.2 to 105.2, and ≥ 105.2
  7. CI: confidence interval
  8. Model 1: adjustment for demographics (age and sex)
  9. Model 2: Adjustment for Model 1 variables plus behaviors (pack years of 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