Volume 25, Number 12—December 2019
Research
Avian Influenza A Viruses among Occupationally Exposed Populations, China, 2014–2016
Table 2
Characteristics of study participants in serosurveys for avian influenza viruses, China, 2014–2016*
Variables | 2014 Dec, n = 700 | 2015 Apr, n = 506 | 2015 Dec, n = 481 | 2016 Apr, n = 437 | Total, n = 2,124 | χ2† | p value |
---|---|---|---|---|---|---|---|
Sex, no. (%) | |||||||
M | 369 (52.7) | 264 (52.2) | 278 (51.8) | 236 (54.0) | 1,147 (54.0) | 3.94 | 0.27 |
F |
331 (47.3) |
242 (47.8) |
203 (42.2) |
201 (46.0) |
977 (46.0) |
||
Age, y, no. (%)‡ | |||||||
<21 | 10 (1.4) | 6 (1.2) | 4 (0.8) | 11 (2.5) | 31 (1.5) | 1.43 | 0.23 |
21–40 | 212 (30.3) | 144 (28.5) | 164 (34.1) | 144 (33) | 664 (31.3) | ||
41–60 | 394 (56.3) | 308 (60.9) | 254 (52.8) | 232 (53.1) | 1,188 (55.9) | ||
>60 | 78 (11.1) | 47 (9.3) | 55 (11.4) | 50 (11.4) | 230 (10.8) | ||
Missing data | 6 (0.9) | 1 (0.2) | 4 (0.8) | 0 | 11 (0.5) | ||
Median age (range)§ |
46 (38–52) |
47 (38–52) |
45 (35–52) |
45 (35–52) |
46 (36–52) |
6.62 |
0.08 |
Type of poultry exposure, no. (%)¶ | |||||||
Processing | 155 (22.1) | 107 (21.1) | 118 (24.5) | 94 (21.5) | 474 (22.3) | 27.88 | 0.006 |
Selling | 423 (60.4) | 332 (65.6) | 299 (62.2) | 191 (43.7) | 1,243 (58.5) | ||
Transportation | 39 (5.6) | 31 (6.1) | 24 (5) | 21 (4.8) | 115 (5.4) | ||
Feeding | 191 (27.3) | 125 (24.7) | 124 (25.8) | 93 (21.3) | 533 (25.1) | ||
Others | 59 (8.4) | 35 (6.9) | 25 (5.2) | 48 (11) | 167 (7.9) | ||
Missing data |
0 |
0 |
2 (0.4) |
0 |
2 (0.1) |
||
Length of poultry exposure, y (range)§ |
8 (3–15) |
8 (3–15) |
5 (2–10) |
5 (3–10) |
6 (3–13) |
61.63 |
<0.001 |
Vaccinated against seasonal influenza, no. (%) | 23 (3.3) | 8 (1.6) | 20 (4.2) | 8 (1.8) | 59 (2.8) | 8.20 | 0.04 |
*Some participants participated in >1 survey.
†By χ2 test, unless otherwise indicated.
‡By χ2CMH test. Missing data were not calculated.
§By Kruskal-Wallis test.
¶Most participants had multiple exposure types. Sums of percentages exceed 2,124. Missing data were not calculated.
1These authors contributed equally to this article.