By the end of September 2017, more than 56,100 persons were injured as a consequence of accidents at work. According to the data of the Central Statistical Office, the most accident-prone sectors included industrial processing, trade, transport, storage, and construction. Due to their inability to work, employees collectively spent more than 1.8 million days on sick leaves – this is more than 33 days per one injured person. In many situations, the consequences of the accident could have been much less serious if appropriate aid was provided immediately. Human health and lives frequently depend on whether employees (or witnesses of an accident) are able to react properly and provide first aid.