Research Article
The Relationship between the 24 h Blood Pressure Variability and Carotid Intima-Media Thickness: A Compared Study
Table 1
Clinical characteristics of all the subjects and the two subgroups: normal IMT group and abnormal IMT group.
| Characteristics | All subjects () | IMT < 1.0 mm () | IMT ≥ 1.0 mm () | P value |
| Age (years) | 58.7 ± 12.1 | 52.4 ± 10.6 | 63.2 ± 11.1 | 0.000** | Male gender (%) | 53.3 | 38.5 | 64.7 | 0.273 | Smoking (%) | 23.3 | 11.5 | 32.4 | 0.573 | IMT ≥ 1.0 mm (%) | 56.7 | 0 | 100 | <0.001** | Presence of plaque (%) | 46.7 | 19.2 | 67.6 | <0.001** | Hypertensive patients (%) | 76.7 | 69.2 | 82.4 | 0.196 | CCA IMT (mm) | 0.9 ± 0.2 | 0.76 ± 0.11 | 1.08 ± 0.15 | <0.001** | Bulb IMT (mm) | 0.8 ± 0.3 | 0.62 ± 0.10 | 0.89 ± 0.29 | <0.001** | ICA IMT (mm) | 0.6 ± 0.1 | 0.54 ± 0.08 | 0.64 ± 0.10 | <0.001** | 24 h SBP (mmHg) | 120.2 ± 16.3 | 121.3 ± 17.4 | 119.3 ± 15.6 | 0.813 | 24 h DBP (mmHg) | 76.6 ± 12.9 | 78.4 ± 14.4 | 75.2 ± 11.6 | 0.148 | 24 h PP (mmHg) | 43.6 ± 9.2 | 42.8 ± 7.6 | 44.1 ± 10.4 | 0.142 | Daytime SBP (mmHg) | 121.2 ± 16.0 | 122.1 ± 17.0 | 120.4 ± 15.4 | 0.763 | Daytime DBP (mmHg) | 77.5 ± 12.8 | 79.2 ± 14.2 | 76.2 ± 11.7 | 0.131 | Daytime PP (mmHg) | 43.7 ± 9.1 | 43.0 ± 7.8 | 44.2 ± 10.1 | 0.125 | Nighttime SBP (mmHg) | 116.7 ± 18.7 | 118.6 ± 19.2 | 115.2 ± 18.4 | 0.860 | Nighttime DBP (mmHg) | 73.5 ± 13.6 | 76.1 ± 15.1 | 71.5 ± 12.2 | 0.204 | Nighttime PP (mmHg) | 43.2 ± 10.4 | 42.4 ± 8.0 | 43.8 ± 11.9 | 0.234 | SBP decrease (%) | 3.6 ± 6.8 | 3.5 ± 5.5 | 3.8 ± 7.8 | 0.838 | DBP decrease (%) | 5.0 ± 6.9 | 4.5 ± 5.0 | 5.3 ± 8.1 | 0.723 |
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IMT: intima-media thickness; CCA: common carotid artery; ICA: internal carotid artery; SBP: systolic blood pressure; DBP: diastolic blood pressure; PP: pulse pressure. **Correlation is significant at the 0.01 level.
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