Table 1. General Characteristics of Participants.
| Characteristics | Total Participants, No. (%) | |
|---|---|---|
| Peritonsillar Abscess | Control Group | |
| Age, y | ||
| 0-4 | 8 (0.2) | 32 (0.2) |
| 5-9 | 33 (0.9) | 132 (0.9) |
| 10-14 | 101 (2.6) | 404 (2.6) |
| 15-19 | 374 (9.8) | 1496 (9.8) |
| 20-24 | 473 (12.4) | 1892 (12.4) |
| 25-29 | 493 (12.9) | 1972 (12.9) |
| 30-34 | 574 (15.0) | 2296 (15.0) |
| 35-39 | 464 (12.1) | 1856 (12.1) |
| 40-44 | 398 (10.4) | 1592 (10.4) |
| 45-49 | 303 (7.9) | 1212 (7.9) |
| 50-54 | 189 (4.9) | 756 (4.9) |
| 55-59 | 139 (3.6) | 556 (3.6) |
| 60-64 | 109 (2.9) | 436 (2.9) |
| 65-69 | 73 (1.9) | 292 (1.9) |
| 70-74 | 50 (1.3) | 200 (1.3) |
| 75-79 | 25 (0.7) | 100 (0.7) |
| 80-84 | 9 (0.2) | 36 (0.2) |
| ≥85 | 4 (0.1) | 16 (0.1) |
| Sex | ||
| Male | 2252 (59.0) | 9008 (59.0) |
| Female | 1567 (41.0) | 6268 (41.0) |
| Income | ||
| 1 (Lowest) | 40 (1.0) | 160 (1.0) |
| 2 | 241 (6.3) | 964 (6.3) |
| 3 | 259 (6.8) | 1036 (6.8) |
| 4 | 315 (8.2) | 1260 (8.2) |
| 5 | 333 (8.7) | 1332 (8.7) |
| 6 | 360 (9.4) | 1440 (9.4) |
| 7 | 430 (11.3) | 1720 (11.3) |
| 8 | 421 (11.0) | 1684 (11.0) |
| 9 | 454 (11.9) | 1816 (11.9) |
| 10 | 470 (12.3) | 1880 (12.3) |
| 11 (Highest) | 496 (13.0) | 1984 (13.0) |
| Region of residence | ||
| Urban | 1820 (47.7) | 7280 (47.7) |
| Rural | 1999 (52.3) | 7996 (52.3) |
| Hypertension | 548 (14.3) | 2192 (14.3) |
| Diabetes | 308 (8.1) | 1232 (8.1) |
| Dyslipidemia | 548 (14.3) | 2192 (14.3) |
| Mean daily temperature for 14 d, mean (SD), °C | 13.2 (9.6) | 13.4 (9.5) |
| Highest daily temperature for 14 d, mean (SD), °C | 18.4 (9.4) | 18.6 (9.3) |
| Lowest daily temperature for 14 d, mean (SD), °C | 8.8 (10.1) | 9.0 (9.9) |
| Daily temperature difference for 14 d, mean (SD), °C | 9.6 (2.4) | 9.5 (2.3) |
| Relative humidity for 14 d, mean (SD), % | 66.0 (10.5) | 66.1 (10.7) |
| Spot atmospheric pressure for 14 d, mean (SD), hPa | 1006.1 (7.5) | 1006.0 (7.7) |
| SO2 for 14 d, mean (SD), ppb | 5.6 (1.9) | 5.6 (2.0) |
| NO2 for 14 d, mean (SD), ppb | 26.0 (8.9) | 24.26 (8.6) |
| O3 for 14 d, mean (SD), ppb | 22.0 (8.5) | 22.8 (8.6) |
| CO for 14 d, mean (SD), ppb | 0.589 (0.191) | 0.588 (0.199) |
| PM10 for 14 d, mean (SD), μg/m3 | 54.7 (18.8) | 53.4 (18.5) |
Abbreviations: CO, carbon monoxide; NO2, nitrogen dioxide; O3, ozone; PM10, particulate matter less than 10 μg; ppb, parts per billion; ppm; SO2, sulfur dioxide.