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Table 4 Comparison of autonomic function tests results of the current study with those of previous studies in Caucasians.

From: Cardiovascular autonomic function tests in an African population

Age groups (years) Autonomic function test p (One-sample t-test)
  HR variation to deep breathing (bpm)
(means (SD))
 
  Current study Mathias and Bannister [31] Ewing et al. [7]  
20–29 23 (7) 20 (2)   < 0.001
30–39 19 (6) 19 (3)   0.690
40–49 18 (6) 15 (2)   0.001
50–59 15 (5) 17 (2)   0.056
60–69 14 (4) 12 (1)   0.065
70+ 15 (7) 9 (1)   < 0.001
All ages 19 (7)   31 (9) < 0.001
  HR response to standing (bpm)
(means (SD))
 
  Current study Mackay et al. [30]   
All ages 24 (9) 27 (8)   < 0.001
  Postural change in SBP (mmHg)
(means (SD))
 
  Current study Ziegler et al. [18] Ewing et al. [7]  
All ages -3 (8) -10 (8) -1 (8) < 0.001a
  Postural change in DBP (mmHg)
(means (SD))
 
  Current study Ziegler et al. [18]   
All ages 9 (7) -2 (6)   < 0.001
  1. aThe p-value applies to both comparative studies.