Baseline characteristics of study population
| N/mean | %/±SD | |
| Medication adherence (medical possession rate, MPR) | 0.79 | ±0.29 |
| High adherence (MPR≥0.8) | 26 512 | 68.8 |
| Intermediate adherence (0.5≤MPR<0.8) | 4996 | 13.0 |
| Poor adherence (MPR<0.5) | 7012 | 18.2 |
| Age | ||
| 30–49 | 8670 | 22.5 |
| 50–59 | 13 423 | 34.9 |
| 60–69 | 10 468 | 27.2 |
| 70 | 5959 | 15.5 |
| Sex | ||
| Men | 20 870 | 54.2 |
| Women | 17 649 | 45.8 |
| Income | ||
| Medical aid | 602 | 1.6 |
| Low (0%–20%) | 6089 | 15.8 |
| Middle (20.1%–80%) | 20 390 | 52.9 |
| High (80.1%–100%) | 11 439 | 29.7 |
| Region | ||
| Urban | 26 620 | 69.1 |
| Rural | 11 900 | 30.9 |
| Charlson Comorbidity Index | 1.65 | ±1.25 |
| Metabolic syndrome | ||
| Absence | 24 543 | 63.7 |
| Presence | 13 977 | 36.3 |
| Family history of stroke | ||
| Absence | 35 230 | 91.5 |
| Presence | 3290 | 8.5 |
| Number of antihypertensive medication | ||
| One | 29 199 | 75.8 |
| More than 1 | 9321 | 24.2 |
| Duration of hypertension (year) | ||
| ≤2 | 17 191 | 44.6 |
| 2–5 | 13 154 | 34.2 |
| 5–10 | 8175 | 21.2 |
| Year | ||
| 2009 | 11 272 | 29.3 |
| 2010 | 9650 | 25.1 |
| 2011 | 6755 | 17.5 |
| 2012 | 6070 | 15.8 |
| 2013 | 4773 | 12.4 |
| Total | 38 520 | 100.0 |