Table 1 Questionnaire for potential risk factors of acute infectiona
Question/statement | Coding | Note |
|---|---|---|
Age | Years | Continuous variable |
Gender | Female = 1 Male = 2 | |
Trial arms | Control = 0 Soap = 1 Alcohol = 2 | No specific hygienic instructions Hand washing with soap and water Hand cleaning with alcohol rub |
No young children in the household | Yes = 0; No = 1 | The question was negative |
School-aged child(ren) in the household | Yes = 1; No = 0 | |
Younger than school-aged child(ren) | Yes = 1; No = 0 | |
Child(ren) in outside-home day care | Yes = 1; No = 0 | |
At-job-exposed adult in the household | Yes = 1; No = 0 | A nonparticipant exposed in her/his work to sick children/patients with acute infections |
Regular use of public transport | Yes = 1; No = 0 | To and from the workplace |
Chronic cardiovascular or respiratory disease | Yes = 1; No = 0 | Requirement: physician-diagnosed |
Influenza vaccination in autumn 2008 | Yes = 1; No = 0 | “Do not know” = 0 |
Business travel | Monthly or more = 1; Less = 0 | Domestic travel to other cities or communities included |
Smoking | Yes = 1; No = 0 | Yes = currently smoking; No = never smoked or not anymore |
Passive smoking | Yes = 1; No = 0 | Exposure to cigarette/tobacco smoke due to other smokers |