Table 1.

Questionnaire structure.

Question	Answer Options
Q1. How often do you drink coffee (one cup of coffee)? Choose the answer that suits you the best (only one option).	(1) once a day; (2) twice a day; (3) three or four times a day; (4) three or four times a week; (5) once a week; (6) three times a month; (7) once a month; (8) never (if respondents choose this answer, they end the questionnaire)
Q2. What kind of coffee do you like usually drink?	(1) roasted coffee beans; (2) grain coffee (from cereals); (3) decaffeinated coffee; (4) ground roasted coffee (coffee powder); (5) flavored coffee; (6) instant coffee; (7) low-acid coffee; (8) coffee beverages
Q3. What brands of coffee do you choose most often?	Please list: Nescafe, Tchibo, Jacobs, Segafredo, Lavazza, MK Café, Maxwell House, Pedros, Woseba, Astra, other (please specify)
Q4. How do you drink your coffee?	(1) black, unsweetened; (2) with sugar; (3) with sugar substitutes (sweetener); (4) with milk; (5) with cream; (6) other (please specify)
Q5. Is the method of preparation of the coffee infusion important to you?	(1) yes; (2) no; (3) sometimes
Q6. How do you brew your coffee?	(1) in a drip coffee maker; (2) flooded with boiling water in a cup or glass; (3) in a French press coffee maker; (4) cold brew method; (5) in a pressure coffee machine; (6) in a moka pot; (7) percolator coffee maker; (8) AeroPress coffee maker; (9) I don’t brew coffee
Q7. How long do you brew your coffee?	(1) <3 min; (2) 3 min; (3) 4 min; (4) 5 min; (5) 6 min; (6) I do not pay attention to the brewing time
Q8. What type of water do you use to prepare the infusion?	(1) tap water from the mains water supply; (2) filtered water; (3) oligocene water; (4) mineral water still
Q9. How many spoons of coffee do you use for brewing (per cup)?	(1) “more or less”; (2) according to the recommendations on the coffee package; (3) other; (4) 1–1.5 teaspoons; (5) 2–2.5 teaspoons; (6) 3–4 teaspoons; (7) 5 teaspoons or more; (8) a measuring cup for a coffee machine, capsules.
Q10. At what temperature do you brew your coffee?	(1) 100 °C; (2) 93 °C; (3) 98 °C; (4) I don’t pay attention to it
Q11. What kind of coffee drink do you prefer?	(1) Americano—a type of coffee drink prepared by diluting an espresso with hot water; (2) espresso—strong coffee brewed in an espresso machine, served in a small cup; (3) cappuccino—espresso with hot, strongly frothed milk (with a fluffy foam); (4) iced coffee; (5) latte—espresso with a lot of hot, gently frothed milk or latte macchiato—hot milk, espresso, and a fluffy foam; (6) caffé mocha—espresso served with hot milk and dark or milk chocolate;(7) other (please specify)
Q12. What do you appreciate the most about the quality of coffee you drink?	(1) color; (2) flavor; (3) aroma; (4) appearance; (5) coffee strength
Q13. When I buy coffee, I usually take into consideration: 13.1: Price; 13.2: Quality; 13.3: Brand; 13.4: Packaging (attractiveness, information); 13.5: Friends’ opinions; 13.6: Presentation on a shelf in a store; 13.7: Promotion; 13.8: Habits; 13.9: Advertisement; 13.10: Flavor (taste and aroma); 13.11: Convenience; 13.12: Health reasons; 13.13: Others (please specify)	Choose a comment for each statement (Likert scale): (1) Definitely do not agree; (2) Do not agree; (3) I tend to disagree; (4) Undecided; (5) I tend to agree; (6) Agree; (7) Definitely agree
Q14. Where do you drink your coffee? Choose the answers that suits you the best.	(1) at home; (2) in canteens; (3) in a café; (4) at friends’, family members’ homes; (5) at work
Sociodemographic data: Gender:	Choose the right answer: (1): women; (2): men;
Age:	(1): 18–25 years old; (2): 26–30 years old; (3): 31–40 years old;(4): 41–50 years old; (5): 51–65 years old
Education:	(1): vocational or primary school; (2): secondary school; (3): higher education (university);
Dwelling place:	(1): city over 100,000 inhabitants; (2): city between 50,000–100,000 inhabitants; (3): city between 10,000–50,000 inhabitants; (4): city below 10,000 inhabitants and village;