Table 1

Characteristics of study cohort (n=92)

VariableTertiles of SBP coefficient of variation
All1 (lowest variability)23 (highest variability)P value
N (%)N (%)N (%)N (%)
All, n (row %)92 (100.00%)31 (33.70%)30 (32.61%)31 (33.70%)
Age, mean (SD)44.71 (12.16)45.03 (14.29)45.93 (12.54)43.19 (9.41)0.673
Female50 (54.35%)18 (58.06%)20 (66.67%)12 (38.71%)0.08
White race76 (82.61%)29 (93.55%)25 (83.33%)22 (70.97%)0.063
Within-subject SBP
 Mean (mm Hg), mean (SD)124.05 (13.19)128.01 (12.98)118.16 (11.86)125.78 (13.00)0.008
 SD (mm Hg), mean (SD)9.94 (4.59)5.82 (2.05)9.17 (1.41)14.79 (3.91)<0.001
 Maximum (mm Hg), mean (SD)137.95 (15.11)135.74 (13.70)132.60 (12.37)145.32 (16.34)0.002
 Minimum (mm Hg), mean (SD)110.68 (14.19)120.45 (13.11)105.43 (11.24)106.00 (12.95)<0.001
 Number of measures, mean (SD)7.93 (5.53)6.29 (3.97)10.33 (6.18)7.26 (5.57)0.011
Body mass index (kg/m²), mean (SD)29.03 (6.02)28.73 (5.64)28.04 (5.25)30.28 (6.99)0.33
Depression19 (20.65%)4 (12.90%)11 (36.67%)4 (12.90%)0.031
Hypertension28 (30.43%)13 (41.94%)9 (30.00%)6 (19.35%)0.154
PDDS score, mean (SD)2.22 (1.89)1.52 (1.95)2.73 (1.70)2.42 (1.86)0.031
PDDS score, median (IQR)2 (0–4)0 (0–3)3 (1–4)2 (1–4)
PDDS score (3 groups)
 No or mild (0–1)40 (43.48%)19 (61.29%)9 (30.00%)12 (38.71%)0.163
 Moderate (2–3)27 (29.35%)6 (19.35%)11 (36.67%)10 (32.26%)
 Severe (4 or higher)25 (27.17%)6 (19.35%)10 (33.33%)9 (29.03%)
  • All percentages are either column percentages (col. %) or row percentages (row %). P-values for continuous variables were computed using one-way analysis of variance and those for categorical variables were based on Pearson χ2tests.

  • PDDS, patient-determined disease steps; SBP, systolic blood pressure.