The article "Weekly Personal Ozone Exposure and Respiratory Health in a Panel of Greek Schoolchildren" (A. Karakatsani, E. Samoli, et al., Environmental Health Perspectives, 2017, online) describes a study of the health effects of ozone air pollution on children's health. Out of 70 children who lived in areas with low ozone levels, 30 missed at least one day of school during a five-week period. Out of 118 children who lived in areas with high ozone levels, 53 missed at least one day of school during the same five-week period. Can you conclude that children who live in high ozone areas are more likely to miss a day of school?