Table 4. Comparison of the number and percentage of correct answers to the questions about general signs of PIDs.

No	Question	2016		2019
		n = 82		n = 67
		n	%	n	%
1.	PIDs occur only in children	28	34.1	49	73.1
2.	Common variable immunodeficiency (CVID) is most often diagnosed in children	15	18.3	16	23.9
3.	Oncological diseases can by a sign of PID	50	61.0	53	79.1
4.	Autoimmune diseases are much more common in patients with PID	64	78.0	58	86.6
5.	Infections with atypical localization or caused by atypical pathogens may be a sign of PID	67	81.7	58	86.6
	Total	224	54.6	234	69.9*

*P<0.0001