## 4 Research Results  
### Analysis of Occupational Accidents  
The control reports concerning 219 people injured in occupational accidents at workplaces that use building scaffoldings were analyzed with regards to the causes of the accidents. An interesting factor for the authors of this study was the human cause--consumption of alcohol, narcotic drugs, or psychotropic substances [70]. The cause related to alcohol consumption occurred in 38 injured people, which was 17.4% of all people injured in accidents on scaffolding. This means that every sixth occupational accident was caused by an abnormal sobriety of an employee. In 22 control protocols, labor inspectors determined the exact value of the alcohol content in the blood of the injured person. In the remaining 16 cases, the protocol only provided information about the cause of the accident--alcohol consumption. A detailed analysis of the alcohol content in a victim's blood showed that the lowest amount of ethyl alcohol in the blood was equal to 0.20%o (state after consumption indicates alcohol consumption with typical symptoms of diffuse attention), while the highest identified value was equal to 4.16%o (intoxication with typical symptoms such as balance disorder, speech disorder, drowsiness, decreased behavior, and movement control, and also impairment of hand-eye coordination). The average alcohol content value in a victim's blood was equal to 1.20 \(\pm\) 1.10%o. Therefore, the state after consumption of alcohol was determined in the case of four people, while the remaining 18 people were in the state of intoxication. The age structure of people for whom the accident was caused by alcohol is shown in Figure 4. The most numerous group was employees aged 40-49 (34.2% of all people with alcohol in their blood) and 30-39 (31.58%). It was in these age ranges (30-49) that the highest levels of ethyl alcohol were found in the blood. The average age of victims was 40 \(\pm\) 8 years. It can be stated that the percentage of alcohol-consuming workers increases with age. The effect of the accident was also analyzed. Accidents were divided into fatal, severe, and light, and are shown in Figure 5. The age structure is as follows:  
* Eight people had a fatal accident, which was 21% of the analyzed accidents. The alcohol content in five people for whom the blood alcohol content was known ranged from 0.53-4.16%o (mean value of 1.97 \(\pm\) 0.94%o). This means that all injured people were intoxicated (alcohol content greater than 0.50%o). * Seventeen people had a severe accident, which represented 45% of all the analyzed cases. The alcohol content in 10 people for whom their blood alcohol content was known ranged from 0.22-3.40%o (mean value of 1.47 \(\pm\) 0.81%o). Two of them were in a state after the consumption of alcohol (alcohol content of less than 0.50%o), and the remaining eight people were drunk. * Thirteen people suffered a light accident, which represented 34% of all the analyzed cases. The alcohol content in seven people for whom the blood alcohol value was known ranged from 0.44-3.00%o (mean value 1.37 \(\pm\) 0.86%o). Two of them were in a state after the consumption of alcohol (alcohol content of less than 0.50%o), and the remaining five people were drunk. On the basis of the control protocols, we were also able to determine the exact time at which the accident occurred. The analysis was carried out for 22 accidents for which the time of the accident and the content of alcohol in the victim's blood were known. Unreal situations were rejected for each accident, e.g., consumption of more than 5000 mL of 4.5% beer--10 beers (life-threatening situation). The most probable scenario was selected. Table 2 presents the values of alcohol consumption with regards to the content of ethyl alcohol in the blood (%o), the time of the accident, the adopted scenario, and the estimated number of consumed beers.