Content, Qualifiers, and Links of Manually Coded H1N1 Tweets.

a2300 hrs on Sept. 28 had only 20 eligible tweets. bThe percent total will not equal 100% as not all tweets had qualifiers and tweets with multiple qualifiers were coded multiple times. Approximately 40% of tweets contained qualifiers. cThe total will not equal to 100% as not all tweets had links. Approximately 60% of tweets contained links. *chi-square test for trend significant at p<0.05.