| | Characteristics | Subgroup | Sample size | Proportion of the sample, % (95% CI) | No. of positive cases | Unweighted proportion positive for IgM or IgG, % (95% CI) | Unweighted proportion positive for only IgM, % (95% CI) | Unweighted proportion positive for only IgG, % (95% CI) |
| | Entire sample | — | 503 | 100 | 196 (168 IgG, 28 IgM) | 39.0 (34.8–43.3) | 5.6 (3.8–8.0) | 33.3 (29.3–37.7) | | Gender | Male | 159 | 31.6 | 68 (58 IgG, 10 IgM) | 42.8 (35.0–50.8) | 6.3 (3.2–11.5) | 36.4 (29.1–44.5) | | Female | 344 | 68.4 | 128 (110 IgG, 18 IgM) | 37.2 (32.1–42.6) | 5.2 (3.2–8.3) | 31.9 (27.1–37.2) | | Age, y | 20–34 y | 189 | 37.6 | 63 (51 IgG, 12 IgM) | 33.3 (26.7–40.6) | 6.3 (3.4–11.0) | 27.0 (20.9–34.0) | | 35–54 y | 274 | 54.5 | 119 (104 IgG, 15 IgM) | 43.4 (37.5–49.5) | 5.5 (3.2–9.0) | 37.9 (32.2–44.0) | | >54 y | 40 | 8.0 | 14 (13 IgG, 1 IgM) | 35.0 (21.1–51.7) | 2.5 (0.1–14.7) | 32.5 (19.0–42.9) | | Education | <12 y | 17 | 3.4 | 5 (4 IgG, 1 IgM) | 29.4 (11.3–55.9) | 5.9 (3.1–30.7) | 29.4 (11.3–55.9) | | 12 y | 67 | 13.3 | 24 (22 IgG, 2 IgM) | 35.8 (24.7–48.5) | 3.0 (0.1–11.3) | 32.8 (22.1–45.5) | | 12–16 y | 302 | 60.0 | 115 (94 IgG, 21 IgM) | 38.1 (32.6–43.8) | 7.0 (4.4–10.6) | 31.1 (26.0–36.7) | | >16 y | 117 | 23.3 | 52 (46 IgG, 6 IgM) | 44.4 (35.3–53.9) | 5.1 (2.1–11.2) | 39.3 (30.0–48.8) | | Blood group | A | 171 | 34.0 | 71 (60 IgG, 11 IgM) | 41.5 (34.1–49.3) | 6.4 (3.4–11.5) | 35.1 (28.1–42.8) | | B | 106 | 5.8 | 42 (38 IgG, 4 IgM) | 39.6 (30.4–49.6) | 3.8 (0.1–9.9) | 35.8 (26.9–45.8) | | AB | 29 | 21.1 | 11 (10 IgG, 1 IgM) | 37.9 (21.3–57.6) | 3.4 (0.1–19.6) | 34.5 (18.6–54.3) | | O | 197 | 39.2 | 72 (60 IgG, 12 IgM) | 36.5 (29.9–43.7) | 6.1 (3.3–10.6) | 30.4 (24.2–37.4) | | Marital status | Single | 148 | 29.4 | 52 (47 IgG, 5 IgM) | 35.1 (27.6–43.4) | 3.4 (1.2–8.1) | 31.7 (24.5–40) | | Married | 355 | 70.6 | 144 (121 IgG, 23 IgM) | 40.6 (35.4–45.9) | 6.5 (4.2–9.7) | 34.1 (29.2–39.3) | | Job category | Physician | 90 | 17.9 | 41 (35 IgG, 6 IgM) | 45.6 (35.1–56.3) | 6.7 (2.7–14.5) | 38.9 (31.0–52.0) | | Nurse | 235 | 46.7 | 92 (76 IgG, 16 IgM) | 39.1 (32.9–45.7) | 6.8 (4.0–11.0) | 32.3 (27.7–40.1) | | Service worker | 66 | 13.1 | 26 (24 IgG, 2 IgM) | 39.4 (27.8–52.2) | 3.0 (0.1–11.5) | 36.3 (25.1–49.1) | | Lab staff | 23 | 4.6 | 10 (8 IgG, 2 IgM) | 43.5 (23.9–65.1) | 8.7 (0.2–29.5) | 34.7 (17.2–57.1) | | Office staff | 89 | 17.7 | 27 (25 IgG, 2 IgM) | 30.3 (21.2–41.1) | 2.2 (0.3–8.6) | 28.0 (19.3–38.7) | | Household size, residents | 1 | 24 | 4.8 | 10 (9 IgG, 1 IgM) | 41.7 (22.8–63.0) | 4.2 (0.2–22.1) | 37.5 (19.5–59.2) | | 2 | 83 | 16.5 | 34 (30 IgG, 4 IgM) | 41.0 (30.4–52.3) | 4.8 (1.5–12.5) | 36.1 (26.1–47.5) | | 3–5 | 378 | 75.1 | 146 (124 IgG, 22 IgM) | 38.6 (33.7–43.7) | 5.8 (3.7–8.8) | 32.8 (28.1–37.8) | | ≥6 | 18 | 3.6 | 6 (5 IgG, 1 IgM) | 33.3 (14.3–58.8) | 5.6 (0.1–29.3) | 27.8 (10.7–53.6) |
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