Table 2.
Results of growth curve modelling of variables associated with systolic BPV
| Model | Variables | β | P | Explained variance within patients (%) |
Explained variance between patients (%) |
|---|---|---|---|---|---|
| 1 | Age+ethnicity+sex model | 2.89% | 37.59% | ||
| Age | 0.110 | <0.001 | … | … | |
| Age2 | −0.013 | <0.001 | … | … | |
| Ethnicity | 0.271 | <0.050 | … | … | |
| sex | −0.993 | <0.001 | … | … | |
| Sex × age | −0.092 | <0.001 | … | … | |
| Sex × age2 | 0.011 | <0.050 | … | … | |
| 2 | SBP model: model 1+SBP | 3.81% | 48.76% | ||
| SBP | 0.045 | <0.001 | … | … | |
| SBP × age | −0.004 | <0.001 | … | … | |
| 3 | Height model: model 2+height | … | … | ||
| Height | −0.005 | NS | … | … | |
| 4 | BMI model: model 2+BMI | 3.94% | 52.11% | ||
| BMI | 0.029 | <0.001 | … | … | |
| 5 | Waist model: model 2+waist | 3.69% | 51.24% | ||
| Waist | 0.011 | <0.001 | … | … | |
| 6 | Age+ethnicity+sex+SBP modela | … | … | 4.06% | 49.68% |
| 7 | Father’s education model: model 6 + father’s education | 4.22% | 50.82% | ||
| Father’s education | −0.059 | <0.001 | … | … | |
| 8 | Age+ethnicity+sex+SBP modelb | … | … | 3.80% | 48.65% |
| 9 | Family history model: model 8 + family history | … | … | ||
| Family history of essential hypertension | 0.093 | NS | … | … | |
| 10 | Full model: model 7+adipositya | … | |||
| Ethnicity | 0.083 | NS | … | … | |
| Sex | −0.700 | <0.050 | … | … | |
| SBP | 0.043 | <0.050 | … | … | |
| Father’s education | −0.050 | <0.050 | … | … | |
| Adiposity | … | ||||
| (1) BMI | 0.025 | <0.050 | 4.22% | 52.96% | |
| (2) Waist | 0.009 | <0.050 | 4.10% | 52.59% |
BMI, body mass index; BPV, blood pressure variability; SBP, systolic blood pressure. Coding of ethnicity: 0 for European Americans and 1 for African–Americans; coding of sex: 0 for men and 1 for women; coding for family history of essential hypertension: 0 for negative and 1 for positive.
a
Smaller sample size involving 623 patients and 2593 measurements (cases missing on father’s education were excluded).
b
Smaller sample size involving 634 patients and 2615 measurements (cases missing on family history of essential hypertension were excluded).