11. A study was conducted on 12 young adults, who were each followed for 12 months. At the beginning of each month participants were tested for Broncoitis, an infection specific to SCU. The table below shows data for each of the participants during the study (Jan 1, 2017 - Dec 31, 2017). Person Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec L L CO OO NO UI A W N- L L 10 11 12 Start/end of observation At-risk for disease Disease (shaded) Disease that started before observation period L Lost to follow-up (e.g. dropped out of study, could not be contacted)