Firecrackers caused the most injuries overall and among children and young adults (5-24 years). Roman candles, rockets and novelties also injured 100 or more young adults. Reloadables (mortars) injured the most adults (24-64 years). Rockets, sparklers, firecrackers, roman candles, and public displays also caused many injuries in the 24+ age group. Sparklers injured the most toddlers (0-4 years). Rockets and novelties also caused 100+ toddler injuries. The data from 2016 was compiled by the Consumer Products Safety Commission and is summarized in the two charts below:
The CPSC compiles annually a great deal of data on fireworks injuries. They are broken down by age, gender, fireworks type, body part injured, and type of injury (e.g., contusion or burn). They also present pairwise analysis like the above breakdown of injuries by age and type of firework. I grouped the fireworks types provided by the CPSC to focus on ones that caused the most injuries in each age group.
I decided to use two charts to display the injury data. The 100% stacked bar chart on the left combines the age groups and shows the breakdown of the 7,600 reported injuries by fireworks type. The marimekko chart on the left drills down to show injuries by type within each age group. I lined up the two charts so that the y axis for the stacked bar chart also applies to the marimekko chart. I also used the same colors for the series in the two different charts to permit easier comparison. I sorted the series in each chart so that the largest was on the bottom of each bar. You can then easily see the biggest injury contributor overall and within each age group. I excluded the ‘other’ series from the sort so that it always appears on top and I gave it a neutral color.
Here is the chart in SlideShare to download and edit using Mekko Graphics: