TABLE 2—
Prevalence of Symptoms by Demographic, Vaccination, Contact, and Travel History Among 15 942 Travelers Arriving Into Christchurch International Airport, New Zealand: Winter 2008
| Variable | Total,a No. | Symptomatic,b No. (%) | χ2 (P) or 95% CI | |
| All | 15 942 | 2714 (17.0) | ||
| Gender | ||||
| Male | 8065 | 1299 (16.1) | ||
| Female | 7759 | 1420 (18.0) | 11.0 (.001) | |
| Missing | 103 | 15 | ||
| Age, y | ||||
| 0–14 | 1102 | 266 (24.1) | ||
| 15–24 | 2574 | 615 (23.9) | ||
| 25–44 | 5467 | 948 (17.3) | ||
| 45–64 | 4709 | 609 (12.9) | ||
| 65–84 | 1208 | 147 (12.2) | ||
| ≥ 85 | 23 | 4 (17.4) | 34.0 (< .001) | |
| Missing | 858 | 125 | ||
| Influenza vaccination in past 12 mo | ||||
| Yes | 3375 | 594 (17.6) | ||
| No | 11 967 | 2096 (17.5) | 0.01 (.91) | |
| Missing | 600 | 24 | ||
| Contact with someone who was coughing or sneezing in past 3 d | ||||
| Yes | 3967 | 1330 (33.5) | ||
| No | 8803 | 797 (9.1) | ||
| Do not know | 2603 | 543 (20.9) | 490.5 (< .001) | |
| Invalid or missing | 569 | 44 | ||
| If contact, in contact with | ||||
| Someone lived, traveled, stayed with | 2396 | 884 (36.9) | 34.6, 39.2 | |
| Someone visited or worked with | 1528 | 508 (33.2) | 30.6, 35.9 | |
| A stranger | 585 | 148 (25.3) | 21.9, 28.7 | |
| Missing | 15 | 5 | ||
| 1 type of contactc | 3463 | 1140 (32.9) | ||
| 2 types of contact | 421 | 155 (36.8) | ||
| 3 types of contact | 68 | 30 (44.1) | 2.7 (.073) | |
| Travel historyd—spent any time during the last 7 d in | ||||
| New Zealand | 765 | 149 (19.5) | 16.4, 22.6 | |
| Australia | 14 295 | 2480 (17.3) | 16.5, 18.2 | |
| Asia | 799 | 108 (13.5) | 10.5, 16.5 | |
| Africa, Pacific Islands, or South America | 90 | 13 (14.4) | 6.7, 22.2 | |
| North America or Europe | 535 | 83 (15.5) | 12.1, 18.9 | |
| Invalid or missing | 167 | 30 |
a
Excludes the 34 participants who did not give valid symptom information.
b
Symptomatic = having at least 1 of: cough, sore throat, sneezing, fever or chills, runny or blocked nose, muscle aches or pains, feeling generally unwell, chest discomfort, or breathing difficulties.
c
Number of types of contact = how many of the previous questions a participant said “yes” to (someone lived, traveled, stayed with; someone visited or worked with; a stranger).
d
Totals do not add to the numbers in row 1 because more than 1 category could be selected.