Table 1.
Analyses for risk factors for mumps infection during an outbreak in Lu’an, China, 2016–2017.
| Variables | No. of students c | n (%) mumps cases | Univariable OR (95% CI) |
Multivariable OR (95% CI) |
|---|---|---|---|---|
| Gender | ||||
| Male | 555 | 61(11.0) | 1.7(1.1–2.7) a | 1.5(0.9–2.3) |
| Female | 540 | 36(6.7) | Ref. | |
| Birth cohort | ||||
| 2000–2007 (Before EPI e) | 479 | 40(8.4) | 0.9(0.6–1.4) | NA |
| 2008–2011 (After EPI) | 616 | 57(9.3) | Ref. | |
| Time interval since last MuCV immunization d (years) | ||||
| <5 | 134 | 4(3.0) | 0.1(0.04–0.4) b | 0.1(0.03–0.3) b |
| 5- | 631 | 49(7.8) | 0.3(0.2–0.6) b | 0.3(0.2–0.5) b |
| 10- | 123 | 15(12.2) | 0.5(0.3–1.1) | 0.5(0.2–1.09) |
| Unvaccinated | 103 | 21(20.4) | Ref. | |
| Taking school bus to school | ||||
| Yes | 389 | 56(14.4) | 2.7(1.8–4.2) b | 2.3(1.4–3.7) b |
| No | 706 | 41(5.8) | Ref. | |
| Resident student | ||||
| Yes | 43 | 2(4.7) | 0.5(0.1–2.1) | NA |
| No | 1052 | 95(9.0) | Ref. | |
| Principal residence | ||||
| Z township | 373 | 48(12.9) | 2.2(1.4–3.4) b | 1.5(0.9–2.4) |
| Other townships | 722 | 49(6.8) | Ref. | |
a p < 0.05
b p < 0.01
c 45 students with previous mumps infection were excluded from the study.
d 104 students without clear immunization history were excluded.
e EPI: Expanded Program on Immunization