Table 1.

Analysis of the knowledge test in Study 1 (N = 172)

Question	Sum correct - Pre	Sum correct - Post	ΔPre-Post	χ2	p	r	Correct - Pre (%)	Idiff	Idiscr
6. How is basic life support correctly performed?	53	172	119	170,86	< 0,001	0,71	30,3	0,32	0,43
10. What is an AED (automatic external defibrillator)?	70	152	82	85,56	< 0,001	0,51	40	0,43	0,72
9. What do you do if you are unsure whether a person is in cardiac arrest or not?	71	128	57	36,74	< 0,001	0,33	40,6	0,43	0,32
8. How do you perform artificial breaths in an unconscious person?	110	154	44	33,50	< 0,001	0,31	62,9	0,65	0,55
3. A person suddenly loses consciousness and collapses. What do you do?	101	145	44	26,63	< 0,001	0,28	57,7	0,58	0,66
7. On the sketch of the torso below mark with a cross the correct site for chest compressions during basic life support;	72	115	43	21,16	< 0,001	0,25	41,1	0,43	0,43
2. Who can help in a case of cardiac arrest?	143	168	25	20,79	< 0,001	0,24	81,7	0,82	0,31
4. How do you check if a person is breathing normally?	145	164	19	9,41	0,002	0,17	82,9	0,84	0,31
1. How do you recognize a person in cardiac arrest?	113	132	19	4,06	0,044	0,11	64,6	0,67	0,34
5. What kind of breathing is NOT a sign of life?	172	173	1	2,00	0,157	0,08	98,3	0,99	0,02

Note: df = 1. Pre – pre-test; Post – post-test; Δ_Pre-Post - differences between pre- and post-test; χ² – chi square; r - effect size; I_diff - difficulty index; I_discr – discriminating index