Characteristics of participants with and without complete information, Suzhou, 2015–2016
| Participants with complete information (Row %) | Participants without complete information (Row %) | P values | |
| Age group | |||
| 15–24 | 730 (92) | 61 (8) | 0.005 |
| 25–29 | 2521 (94) | 150 (6) | |
| 30–34 | 884 (96) | 37 (4) | |
| 35–39 | 218 (94) | 13 (6) | |
| 40–49 | 18 (100) | 0 (0) | |
| Total | 4371 | 261 | |
| Influenza vaccine | |||
| Vaccinated | 1 | 1 | |
| Education level | |||
| Junior high school or lower (Grade 9) | 343 (91) | 32 (9) | 0.009 |
| Senior high school (Grade 12) | 823 (93) | 61 (7) | |
| College or higher | 3190 (95) | 167 (5) | |