Table 2.

Knowledge assessment with 32-item questionnaire at time point 1 (immediately after intervention)

	Question		Correct answer	Video group, percent correct answers	SOP group, percent correct answers	No-intervention group. Percent correct answers	p-value
Q 1.1.	Wearing non sterile gloves is indicated when	..drawing blood	right	94.8	96.6	95.3	.810
Q 1.2.		..touching a patient who is an MRSA carrier a)	wrong	54.3	43.7	61.7	.017
Q 1.3.		..emptying an urinary bag	right	98.3	97.5	98.4	.897
Q 1.4		..washing a patients‘face b	wrong	73.3	84	85.2	.042
Q 2.1.	Wearing a surgical mask is indicated when	..drawing blood from patients’ suffering from an influenza	right	60.3	55.5	68.8	.094
Q 2.2.		..providing personnel care to a patient with an open tuberculosis a	wrong	50.9	38.7	46.1	.168
Q 2.3.		..suctioning an intubated patient	right	91.4	93.3	82.0	.014
Q 2.4		..providing personnel care to a patient suffering from a cough	right	78.5	59.7	46.1	<.001
Q 3.1.	When performing an open suctioning of a patient with a tracheostoma I have to wear the following personal protective equipment:	gloves	right	98.3	96.6	93.8	.204
Q 3.2.		surgical mask	right	96.6	94.1	82.0	<.001
Q 3.3.		cap	wrong	97.4	87.4	95.3	.007
Q 3.4		goggles	right	91.4	79.0	67.2	<.001
Q 4.1.	To prevent the spread of a respiratory virus when suffering from a common cold...	..I’m only allowed to come to work if I’m vaccinated against influenza a	wrong	98.3	98.3	99.2	.744
Q 4.2.		..I am allowed to cough and sneeze into a handkerchief which I dispose of immediately	right	88.8	82.4	71.1	.002
Q 4.3.		..I am allowed to cough and sneeze into my elbow	right	89.7	78.2	56.3	<.001
Q 4.4		..I wear a surgical mask when in contact to my colleagues	right	94.8	89.9	95.3	.213
Q 5.1.	When wearing non-sterile gloves, I ...	..have to always disinfect my hands before donning gloves	right	82.8	58.0	71.1	<.001
Q 5.2.		..have to always disinfect my hands after doffing gloves	right	93.1	94.1	94.5	.926
Q 5.3.		..am allowed to inject medication without prior hand disinfection after touching the same patient	wrong	87.1	88.2	90.6	.668
Q 5.4		..have to doff the gloves as soon as possible to prevent the spread of germs	right	79.3	73.1	69.5	.211
Q 6.1.	I have to disinfect my hands …	..before touching the bed table of a patient b	right	88.8	76.5	77.3	.023
Q 6.2.		..before shaking hands with a patient	right	95.7	97.5	96.1	.777
Q 6.3.		..between touching a patients‘shoulder and emptying his urinary bag b	wrong	90.5	88.2	84.4	.352
Q 6.4		..between touching a patients‘shoulder and injecting insulin	right	81.9	84.0	84.4	.863
Q 7.1.	Check the correct answers concerning aseptic procedures	When performing an aseptic procedure, I always have to wear short sleeves	right	82.8	79.8	68.8	.025
Q 7.2.		When performing an aseptic procedure, I always have to wear sterile gloves	wrong	60.3	58.0	58.6	.937
Q 7.3.		Aseptic procedures prevent the contamination of clean surfaces and material	right	76.7	83.2	89.1	.037
Q 7.4		If I talk during aseptic procedures I need to wear a mask	right	75.0	73.1	66.4	.298
Q 8.1.	When in direct patient contact, I’m NOT allowed to wear …	..wedding ring	right	98.3	89.1	78.1	<.001
Q 8.2.		..pearl earrings	wrong	88.8	90.8	85.9	.504
Q 8.3.		..nail polish	right	99.1	96.6	93.0	.038
Q 8.4		..watch	right	97.4	98.3	96.9	.842

Caption: 32-item questionnaire with the percentage of correct answers by study group at time point 1

Abbreviations: MRSA Methicillin resistant Staphylococcus aureus, SOP Standard Operating Procedure, Q Question

^a Topics not or only rudimentary thematized in video and SOP. ^b Topics not or only rudimentary covered in the video but covered in the SOP