Table 2. Characteristics of study population in the cross-sectional survey, January 2010.
| Demographic Characteristics | Study subjects N(%) (n = 50,111) | Unvaccinated subjectsN(%) (n = 42,300) | True Chinese population per millionN(%) (n = 1,306.3 million) |
| Age group, years | |||
| 0–5 | 9,914 (19.8%) | 9,512 (22.5) | 84.9 (6.5) |
| 6–15 | 10,500 (21.0%) | 7,409 (17.5) | 197.3 (15.1) |
| 16–24 | 9,513 (19.0%) | 7,485 (17.7) | 164.6 (12.6) |
| 25–59 | 10,684 (21.3%) | 8,984 (21.2) | 689.7 (52.8) |
| ≥60 | 9,500 (18.9%) | 8,910 (21.1) | 169.8 (13.0) |
| Gender | |||
| Male | 24,090 (48.1%) | 20,430 (48.3) | 659.7 (50.5) |
| Female | 26,021 (51.9%) | 21,870 (51.7) | 646.6 (49.5) |
| Occupation# | |||
| Children in family care§ | 3,150 (6.3%) | 3088 (7.3) | |
| Children in kindergarten | 7,118 (14.2%) | 6763 (16.0) | |
| Student | 14,014 (28.0%) | 9871 (23.4) | |
| Teacher | 936 (1.9%) | 609 (1.4) | |
| Doctor or nurse | 2,632 (5.3) | 1311 (3.2) | |
| Other | 22,174 (44.3%) | 20579 (48.7) | |
| Urban/rural | |||
| Capital city (Municipalities) | 16,558 (33.0%) | 13321 (31.5) | 115 (8.8) |
| Other urban areas | 16,496 (32.9%) | 13,791 (32.6) | 446.8 (34.2) |
| Rural areas | 17,057 (34.0%) | 15,188 (35.9) | 744.6 (57.0) |
| Region | |||
| Eastern | 18,314 (36.6%) | 15,483 (36.6) | 437.6 (33.5) |
| Central | 18,067 (36.0%) | 15,276 (36.1) | 502.9 (38.5) |
| Western | 13,730 (27.4%) | 11,541 (27.3) | 365.8 (28.0) |
| Vaccination of pH1N1* | |||
| Yes | 7,799 (15.6%) | ||
| No | 42,300 (84.4%) | ||
| Developed a “cold” since May 1,2009 | |||
| Yes | 23,867 (47.6%) | 19,971 (47.2%) | |
| No | 26,244 (52.4%) | 22329 (52.8) | |
NOTE. # 87 participants were missing occupation data, and 79 unvaccinated participants were missing occupation data.
§
Children in family care is defined as the persons aged ≤15 years that are not student or Children in Kindergarten, or did not worked in any organizations or units.
*12 participants reported unknown vaccination history of pH1N1.