Table 1. Characteristics of study population by blood pressure levels (%)*.
| Total (N) | Level 1a | Level 2 | Level 3 | Level 4 | Level 5 | Level 6 | |
|---|---|---|---|---|---|---|---|
| Total (N) | 31,694 | 1486 | 2896 | 4983 | 11,862 | 7113 | 3354 |
| Age (years) | |||||||
| 18–34 | 539 | 4.2 | 1.7 | 1.9 | 1.4 | 1.4 | 1.7 |
| 35–44 | 2172 | 8.6 | 8.1 | 6.9 | 6.4 | 6.8 | 6.6 |
| 45–54 | 7001 | 22 | 23.7 | 22.7 | 22.3 | 21.3 | 20.7 |
| 55–64 | 11,178 | 32.2 | 35.7 | 36.9 | 36.3 | 34.7 | 31.3 |
| 65–74 | 7649 | 23.7 | 21.7 | 23.1 | 24 | 24.7 | 27.1 |
| 75+ | 3155 | 9.2 | 9.2 | 8.5 | 9.5 | 11 | 12.6 |
| Sex | |||||||
| Men | 12,994 | 39.0 | 40.4 | 41.8 | 41.5 | 41.1 | 39.2 |
| Women | 18,700 | 61.0 | 59.6 | 58.2 | 58.5 | 58.9 | 60.8 |
| Place of residence | |||||||
| Urban | 16,435 | 57.1 | 58.9 | 57.5 | 53.3 | 47.0 | 40.3 |
| Rural | 15,259 | 42.9 | 41.1 | 42.5 | 46.7 | 53.0 | 59.7 |
| Education | |||||||
| Illiterate or some primary school | 11,175 | 33.1 | 30.1 | 31.1 | 33.7 | 38.7 | 45.0 |
| Primary school graduate or some junior high school | 6513 | 18.5 | 18.9 | 19.7 | 20.5 | 21.8 | 21.6 |
| Junior high school graduate or some senior high school | 8338 | 26.4 | 26.6 | 27.9 | 27.4 | 25.0 | 22.4 |
| Senior high school graduate or some college | 4207 | 15.7 | 16.6 | 15.1 | 13.7 | 11.4 | 9.0 |
| College graduate or above | 1461 | 6.3 | 7.7 | 6.3 | 4.6 | 3.0 | 2.0 |
| Marital status | |||||||
| Single | 334 | 1.1 | 0.8 | 1.1 | 1.0 | 1.1 | 1.2 |
| Married or cohabiting | 26,261 | 83.9 | 84.0 | 83.8 | 82.9 | 82.5 | 80.6 |
| Separated/divorced/widowed/others | 5099 | 14.9 | 15.2 | 15.1 | 16.0 | 16.5 | 18.2 |
| Annual per capita household incomeb (US $c) | |||||||
| Don’t know/not sure/refused | 7825 | 22.1 | 22.9 | 24.2 | 24.0 | 26.1 | 27.6 |
| <895 | 6382 | 21.5 | 17.6 | 17.2 | 19.2 | 22.3 | 24.9 |
| 895–1789 | 4004 | 10.6 | 11.5 | 11.5 | 12.9 | 13.2 | 13.9 |
| 1790–5372 | 6917 | 21.5 | 21.8 | 22.7 | 22.6 | 21.1 | 19.6 |
| >5372 | 6566 | 24.3 | 26.2 | 24.4 | 21.4 | 17.2 | 14.0 |
| Medication for raised blood pressure in last two weeks | |||||||
| Yes | 7362 | 27.6 | 20.8 | 20.3 | 22.1 | 25.5 | 26.7 |
| No | 24,332 | 72.4 | 79.2 | 79.7 | 77.9 | 74.5 | 73.3 |
*The numbers in the columns are percentages of study sample by certain characteristics.
aBlood pressure level: level 1 (SBP < 120 mmHg and DBP < 80 mmHg); level 2 (SBP: 120–129 mmHg and/or DBP: 80–84 mmHg); level 3 (SBP: 130–139 mmHg and/or DBP: 85–89 mmHg); level 4 (SBP: 140–159 mmHg and/or DBP: 90–99 mmHg); level 5 (SBP: 160–179 mmHg and/or DBP: 100–109 mmHg); level 6 (SBP > 180 mmHg and/or DBP > 110 mmHg).
bBased on the exchange rate of 6.70 Chinese Yuan Renminbi per US dollar that was in effect on 30 September 2010.
cUS $, United States dollar.