Table 2.

The number of classes, object properties (OP), and data properties (DP) in the knowledge graph

Attribute name	Property type	Number
Health examination Item	Class	1
Physique Examination	Class	98
Laboratory Examination	Class	137
Instrument Examination	Class	79
Personal Health Feature	Class	0
Demography	Class	15
Health History	Class	149
Physical Symptom	Class	48
Lifestyle	Class	8
Environmental Health	Class	4
Mental Health	Class	1
Sleep Health	Class	2
Health Literacy	Class	0
Other Demand	Class	17
Taboo	Class	25
hasItem	OP	315
hasFeature	OP	0
hasRecommendation	OP	466
name	DP	315
definition	DP	2
category	DP	302
gender	DP	110
price	DP	0
value	DP	269
age	DP	10
marital	DP	4
education	DP	0
profession	DP	2
address	DP	0
type	DP	23
year	DP	3
frequency	DP	49
number	DP	5
degree	DP	0