Table 5.
Internal and External Validity Testing Results for the Hypertension Prevalence Estimator Tool, by Random Sample Size
| Hypertension Prevalence, % | Percent Difference, Estimated–Observed | P‐Valuea | ||
|---|---|---|---|---|
| Estimated (95% CI) | Observed | |||
| Internal Validity | ||||
| NHANES random samples (n=1500) | ||||
| Sample 1 | 38.7 (36.3–41.2) | 38.1 | 0.6 | 0.59 |
| Sample 2 | 38.2 (35.8–40.7) | 39.1 | −0.9 | 0.50 |
| Sample 3 | 38.1 (35.6–40.5) | 40.0 | −1.9 | 0.12 |
| NHANES random samples (n=3000) | ||||
| Sample 1 | 37.7 (35.9–39.4) | 37.5 | 0.2 | 0.86 |
| Sample 2 | 38.4 (36.6–40.1) | 39.2 | −0.8 | 0.32 |
| Sample 3 | 38.3 (36.6–40.0) | 38.6 | −0.3 | 0.73 |
| NHANES random samples (n=6000) | ||||
| Sample 1 | 38.5 (37.3–39.7) | 38.5 | 0.0 | 0.96 |
| Sample 2 | 38.8 (37.5–40.0) | 38.4 | 0.4 | 0.56 |
| Sample 3 | 38.5 (37.3–39.8) | 39.1 | −0.6 | 0.36 |
| External Validity | ||||
| Pooled random samples (n=1500) | ||||
| Sample 1 | 44.1 (42.7–45.5) | 46.3 | −2.2 | 0.080 |
| Sample 2 | 44.7 (43.3–46.1) | 48.0 | −3.3 | 0.010 |
| Sample 3 | 45.2 (43.8–46.6) | 47.7 | −2.5 | 0.054 |
| Pooled random samples (n=3000) | ||||
| Sample 1 | 44.0 (43.0–45.0) | 46.4 | −2.4 | 0.008 |
| Sample 2 | 43.2 (42.2–44.2) | 45.5 | −2.3 | 0.012 |
| Sample 3 | 44.3 (43.3–45.2) | 46.3 | −2.0 | 0.024 |
| Pooled random samples (n=6000) | ||||
| Sample 1 | 44.3 (43.6–45.0) | 46.4 | −2.1 | 0.001 |
| Sample 2 | 43.9 (43.2–44.6) | 45.7 | −1.8 | 0.005 |
| Sample 3 | 44.0 (43.3–44.7) | 46.2 | −2.2 | <0.001 |
Abbreviations: CI, confidence interval; NHANES, National Health and Nutrition Examination Survey. aChi‐square test to assess the association between the expected prevalence estimates and the observed prevalence values.