TABLE 1—
Demographic and Health Characteristics of Thermia Participants: China, January 2014–July 2016
| Characteristics | No. (%) |
| Data source | |
| API | 44 941 (99.9) |
| Web | 58 (0.01) |
| Age group | |
| Infant (0–3 y) | 30 490 (68.1) |
| Child (4–11 y) | 6 593 (14.7) |
| Adolescent (12–17 y) | 7 106 (15.9) |
| Adult (≥ 18 y) | 607 (1.4) |
| Number of symptomsa | |
| 0 | 21 918 (48.7) |
| ≥ 1 | 23 081 (51.3) |
| 1 | 10 790 (23.9) |
| 2 | 5 643 (12.5) |
| 3 | 3 607 (8.0) |
| 4 | 1 594 (3.5) |
| 5 | 678 (1.5) |
| 6 | 165 (0.4) |
| 7 | 93 (0.2) |
| 8 | 544 (1.2) |
| Underlying condition status | |
| No underlying condition | 39 946 (88.8) |
| Underlying condition | 5 033 (11.2) |
| Immunization status | |
| Up-to-date immunizations | 34 804 (77.4) |
| Not up-to-date immunizations | 10 179 (22.6) |
| Temperature category | |
| Normal | 11 556 (25.7) |
| Fever (temperature ≥ 100 °F or 37.8 °C) | 33 442 (74.2) |
| ILI status | |
| No ILI | 33 677 (74.8) |
| ILI | 11 322 (25.2) |
Note. API = application program interface; ILI = influenza-like illness, defined as having a fever (temperature ≥ 100 °F or 37.8 °C) and having symptoms of a sore throat or cough.
a
Participants reported any of the following 8 symptoms: rash, vomiting, diarrhea, sore throat, cough, headache, shortness of breath, or fatigue.