We conducted this study in January 2022, where half of the Lebanese population was vaccinated. We used the simple random sampling technique to create our sample, where every person in Lebanon has an even chance of being selected in our sample. All methods were carried out according to the relevant guidelines and regulations.

Data were collected via an online survey distributed randomly among Lebanese people aged above 18. The questions were easy to be understood, written in Arabic (the native language of Lebanon) to avoid any conflict, covering sociodemographic features and attitudes of people towards COVID-19 outbreaks and vaccination.

R language was used for the data analysis, and a p-value ≤ 0.05 was considered to be statistically significant.

The data were collected via a link, so there are no missing values as all the questions were required.

We described the demographic characteristics of the participants, including age, gender, profession, suffering from chronic diseases, and smoking.

For the comparison of categorical variables, we used the chi-square test.

We employed two multivariate logistic regressions to identify the factors affecting the intention of getting vaccinated, taking the dependent variable as getting vaccinated or not for the first regression model, and as the willingness to take the extra dose of the vaccine among the vaccinated respondents for the second regression model, and independent variables as all the variables having a p-value less than 0.2, In the literature, a cut-off value of 0.2 is supported [9], [10].

The sociodemographic and other characteristics of the participants are shown in Table 1.

Overall, 2642 participants enrolled in the study, with 73.13% (1932) aged between 18 and 35 and 83.7% (2212) of them are females. As for profession, 45.04% (1190) are teachers and students, 30.66% (810) are jobless, and the rest are divided into different categories. The majority of the participants don’t suffer from chronic diseases (88.38%; 2335) and don’t smoke (57.99%; 1532), almost half of them got infected with coronavirus (45.61%; 1205) and the symptoms were divided between mild and moderate symptoms (82.82%; 998), severe symptoms (11.45%; 138), and no symptoms (5.73%; 69).

70.4% (1860) of the participants are vaccinated, the most used vaccine is Pfizer (80.32%; 1494), then AstraZeneca (15.81%; 294). Among the vaccinated participants 16.5% (307) had one dose of the vaccine, 76.67% (1426) had two doses while only 6.83% (127) had three doses, and 83.82% (1559) are willing to take the extra dose of the vaccine. Among the non-vaccinated participants (782) only 23.66% (185) are willing to take the vaccine.

By direct question about the reasons that prevent people from getting vaccinated, we see that mistrust in the effectiveness of the vaccine comes in the first place with a proportion of 0.28 followed by the worry about the side effects with a proportion of 0.21 (Figure 1).

Among the vaccinated people, the main reasons for taking the vaccine were “Reliving symptoms in case of infection” and “contributing to preventing outbreaks” with an equal proportion of 0.4 (Figure 2), and a small proportion of participants (0.14) were forced to vaccinate due to travel or work. On the other hand, we asked these vaccinated participants who are not willing to take the next dose of the vaccine about the reason behind this decision to end up with a proportion of 0.52 of them being worried about side effects and 0.25 of them consider it as useless (Figure 3).

A significant relationship was shown between getting infected with coronavirus and getting vaccinated, the percentage of infection among non-vaccinated people (51%) was significantly higher in comparison with the vaccinated participants (43%). AstraZeneca showed a significantly higher percentage of Mild/Moderate and Severe symptoms in comparison with the other vaccines. And the percentage of not willing to take the extra dose of the vaccine is significantly higher for the participants who suffered from severe symptoms due to the previous doses than those who faced mild, moderate, or no symptoms. Age is significantly associated with both coronavirus infection and getting vaccinated, as participants aged more than 50 years old showed a smaller percentage of getting infected, and a higher percentage of getting vaccinated concerning participants aged less than 50. The percentage of vaccinated people among Medical field workers is significantly higher than in the other fields. Also, we detect an association between getting vaccinated and having chronic diseases, knowing people who died due to the vaccine, or who died due to coronavirus, or who died because of infection while they were not vaccinated (Table 2).

All the variables in Table 3 were used as independent variables except those that have a p-value > 0.2.

Table 4 represents the logistic regression results for getting vaccinated (model 1) after splitting the data randomly into 80% training set and 20% test set, and after performing a backward stepwise selection and cleaning the data from influential points. The Hosmer and Leme goodness-of-fit showed a good fitting degree of the model (χ² = 2.8545, p-value = 0.9432). Odds reporting COVID-19 vaccination are significantly associated with age, profession, having chronic diseases, knowing people who died due to the vaccine or due to coronavirus, and the source of information about the vaccine. People aged more than 50 are 2.26 times more likely to get vaccinated in comparison with people below 22. Medical field workers had 2.39 greater odds of getting vaccinated compared to jobless

Significance codes: 0 “***”; 0.001 “**”; 0.01 “*”; 0.05 “.”; 0.1 “”.

respondents. Those who were infected with coronavirus were 30% less likely to get vaccinated compared to non-infected people. And those who know people who died because of the vaccine were less likely to get vaccinated by 26% in comparison with the others, while those who know people who died because of coronavirus infection were more likely to get vaccinated by 89% compared to the others, and for the source of information about COVID-19 vaccine we notice that those who take their information from scientific publications and health workers are almost 2 times more likely to get vaccinated than those who just follow social media news. As for a prediction, the model showed an accuracy of 0.67 and the Roc curve gave an AUC (Area under Curve) of 0.68 (Figure 4).

Among the vaccinated participants (1860, 70.4%), another multivariate logistic regression was performed to find the factors that affect the willingness of taking the next dose of the vaccine, with the Hosmer and Leme goodness of fit test (χ² = 4.1207, p-value = 0.8461) we can assume that the model fits well the data. Medical field workers (OR = 0.36), knowing people who died of coronavirus infection (OR = 0.55), suffering from severe symptoms due to the vaccine (OR = 0.4) and taking another vaccine than AstraZeneca and Pfizer (OR = 0.45), and having taken already two doses of the vaccine (OR = 0.33) were all less likely to get the next dose of the vaccine in comparison with their reference modalities, while only those who know non-vaccinated people who died of coronavirus infection were more likely to take the next dose by 82% in comparison with those who don’t know such people Table 5. The accuracy of this model in predicting the willingness of taking the next dose was 0.83, and the area under the roc curve AUC was equal to 0.68