Table 2.
Pearson correlations between average blood pressure measurements (mm Hg) at a single age and between two ages, and correlations between average BP and prenatal MeHg exposure. BP measurements are the average of duplicate readings.
| N | Systolic BP and Diastolic BP | Diastolic BP (2 ages) | Systolic BP (2 ages) | Diastolic BP and MeHg | Systolic BP and MeHg | |
|---|---|---|---|---|---|---|
| Both sexes: | ||||||
| 12 years | 644 | 0.64 | - | - | −0.02 | 0.02 |
| 15 years | 559 | 0.50 | - | - | 0.10 | 0.03 |
| Across years | 524 | - | 0.32 | 0.34 | - | - |
| Boys: | ||||||
| 12 years | 313 | 0.59 | - | - | −0.03 | 0.03 |
| 15 years | 267 | 0.55 | - | 0.17 | 0.06 | |
| Across years | 244 | - | 0.22 | 0.34 | - | - |
| Girls: | ||||||
| 12 years | 331 | 0.69 | - | - | −0.03 | 0 |
| 15 years | 292 | 0.55 | - | - | 0.04 | 0.04 |
| Across years | 280 | - | 0.39 | 0.40 | - | - |
BP=blood pressure, MeHg = methylmercury. Column 3 of this table gives the correlations between average diastolic and average systolic BP at a single age (12 years or 15 years, as indicated in column 1). Correlations between measurements at two different ages are given in columns 4 and 5. For example, column 4 gives the correlation between diastolic BP at age 12 and diastolic BP at age 15.