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Table 1 Intake questions asked of participants in GIS

From: Internet-based monitoring of influenza-like illness (ILI) in the general population of the Netherlands during the 2003–2004 influenza season

-Age/Male/Female
-Daily occupation? (School/work/home/other)
-Means of transportation? (Car/bike/public)
-How many times per year suffering from cold/ILI? (<2/2–5/>5)
-Recently vaccinated against flu? (Yes/no)
-Do you have asthma or diabetes? (No/asthma/diabetes)
-Do you smoke? (Yes/no)
-Do you follow the recommendations of the Dutch Food and Nutrition Centre? (No/occasionally/daily)
-Do you use vitamins? (No/occasionally/every day)
-Do you follow a diet? (No/vegetarian/veganistic/low-calorie)
-Do you exercise? (<1 hour/week; 1–4 hours; >4 hours per week)
-How many people at home? (Alone/with adults/with adults and children)
-Do the children attend school or nursery? (No/nursery/school)
-Do you have pets? (No/cat(s)/dog(s)/bird(s)/other)