Development, validation and assessment of the test on knowledge about basic life support and use of automated external defibrillator among schoolchildren

Table 2 Analysis of the knowledge test in Study 2 (N = 611)

Question	Sum correct - Pre	Sum correct - Post	Δ_Pre-Post	χ²	p	r	Correct - Pre (%)	I_diff	I_discr
6. How is basic life support correctly performed?	318	585	267	308,17	< 0,001	0,50	52,4	0,52	0,67
10. What is an AED (automatic external defibrillator)?	272	521	249	239,63	< 0,001	0,45	45	0,45	0,78
9. What do you do if you are unsure whether a person is in cardiac arrest or not?	196	398	202	146,05	< 0,001	0,35	32,4	0,32	0,30
3. A person suddenly loses consciousness and collapses. What do you do?	390	559	169	129,47	< 0,001	0,33	64,7	0,65	0,57
8. How do you perform artificial breaths in an unconscious person?	397	561	164	124, 60	< 0,001	0,32	66,1	0,66	0,60
7. On the sketch of the torso below mark with a cross the correct site for chest compressions during basic life support;	292	425	133	55,64	< 0,001	0,22	49,7	0,50	0,33
5. What kind of breathing is NOT a sign of life?	391	514	123	68,93	< 0,001	0,24	64,5	0,65	0,63
2. Who can help in a case of cardiac arrest?	490	575	85	54,01	< 0,001	0,21	80,5	0,80	0,49
4. How do you check if a person is breathing normally?	517	566	49	20,00	< 0,001	0,13	84,9	0,85	0,39
1. How do you recognize a person in cardiac arrest?	416	451	35	4,33	0,037	0,06	68,5	0,69	0,35

Note: Questions are sorted by increasing difficulty. 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

ISSN: 1757-7241