Table 2.

Overall and module-specific knowledge scores for the total sample and stratified by gender, Lactose Intolerance status and nutritional expertise

	Total	Overall knowledge score#		Module 1 Definition score#		Module 2 Symptoms score#		Module 3 Diagnosis score#		Module 4 Management score#
	N	Mean ± SD	P-value	Mean ± SD	P-value	Mean ± SD	P-value	Mean ± SD	P-value	Mean ± SD	P-value
ALL	2025	15.4 ± 7.6		5.5 ± 2.2		3.4 ± 2.9		3.7 ± 3.4		2.8 ± 2.4
Gender $
Male	284	12.6 ± 8.4	Ref.	4.8 ± 2.5	Ref.	2.9 ± 3.0	Ref.	2.8 ± 3.5	Ref.	2.1 ± 2.6	Ref.
Female	1730	15.9 ± 7.4	< 0.0001	5.6 ± 2.1	< 0.0001	3.5 ± 2.9		3.8 ± 3.4	< 0.0001	2.9 ± 2.4	< 0.0001
Lactose intolerance
No	913	14.7 ± 8.4	Ref.	5.3 ± 2.3	Ref.	3.3 ± 3.0	Ref.	3.4 ± 3.6	Ref.	2.6 ± 2.5	Ref.
Suspected	401	14.0 ± 7.4	0.14	5.4 ± 2.3	0.51	3.4 ± 3.0	0.74	2.6 ± 3.2	< 0.0001	2.6 ± 2.5	0.99
Confirmed	711	17.0 ± 6.2	< 0.0001	5.8 ± 2.0	< 0.0001	3.5 ± 2.8	0.33	4.6 ± 3.0	< 0.0001	3.2 ± 2.2	< 0.0001
Nutrition expert
No°	1558	13.6 ± 7.2	Ref.	5.1 ± 2.2	Ref.	3.0 ± 2.8	Ref.	3.0 ± 3.3	Ref.	2.6 ± 2.4	Ref.
Yes	467	21.3 ± 5.9	< 0.0001	6.6 ± 1.6	< 0.0001	4.9 ± 2.9	< 0.0001	6.1 ± 2.8	< 0.0001	3.7 ± 2.2	< 0.0001

Abbreviations. SD: Standard Deviation; Ref: Reference

^$11 respondents preferred not to specify their gender

°Include 550 respondents interested in nutrition topics

#Total knowledge score: -39 to + 39; Module 1: -8 to + 8; Module 2: -12 to + 12; Module 3: -9 to + 9; Module 4: -10 to + 10

P-values based on Student’s t-test