TABLE 3.
Effect of beverage consumption on ambulatory and office blood pressure
| Variable | Sample size | Before grape juice | After grape juice | Before placebo | After placebo | P1 |
| 24-h Ambulatory blood pressure | ||||||
| Systolic blood pressure (mm Hg) | 64 | 124 ± 112 | 122 ± 10 | 124 ± 12 | 124 ± 10 | 0.67 |
| Diastolic blood pressure (mm Hg) | 64 | 77 ± 8 | 76 ± 7 | 78 ± 9 | 77 ± 8 | 0.90 |
| Pulse pressure (mm Hg) | 64 | 47 ± 7 | 46 ± 7 | 47 ± 8 | 47 ± 7 | 0.35 |
| Heart rate (beats/min) | 64 | 76 ± 10 | 76 ± 12 | 76 ± 10 | 76 ± 12 | 0.53 |
| Nocturnal dip in systolic blood pressure (%) | 63 | 6.8 ± 7.4 | 8.2 ± 7.4 | 9.9 ± 7.1 | 7.6 ± 8.3 | 0.005 |
| Nocturnal dip in diastolic blood pressure (%) | 63 | 9.9 ± 9.8 | 11.4 ± 8.6 | 13.0 ± 8.7 | 11.1 ± 9.7 | 0.03 |
| Office blood pressure (mm Hg) | ||||||
| Systolic blood pressure | 63 | 133 ± 12 | 132 ± 12 | 133 ± 11 | 132 ± 10 | 0.76 |
| Diastolic blood pressure | 64 | 80 ± 10 | 79 ± 10 | 80 ± 8 | 78 ± 8 | 0.32 |
1
P for treatment by follow-up interaction as determined by using a general linear model for correlated data with PROC MIXED, an unstructured covariance matrix, and standard restricted maximum likelihood estimation in SAS (SAS Institute Inc, Cary, NC).
2
Mean ± SD (all such values).