Table 5.

Clusters of keywords that co-occurred in Web of Science under the keyword search related to it with the number of occurrences (O) and total link strength (TLS)

Web of Science
Cluster 1			Cluster 2			Cluster 3			Cluster 4
Keyword	O	TLS	Keyword	O	TLS	Keyword	O	TLS	Keyword	O	TLS
patterns	43	103	mobility	146	371	Health	41	128	elderly	55	199
physical activity	35	145	migration	33	68	Risk	30	84	people	27	81
behavior	32	70	residential mobility	32	66	Aging	20	74	dementia	18	46
walking	32	137	age	28	76	Mortality	19	51	performance	17	39
accessibility	30	83	home	22	51	Dynamics	17	19	gait	14	41
built environment	28	125	distance	17	45	Disability	16	58	balance	13	44
neighborhood	23	94	gender	16	45	Environment	16	53	falls	10	37
determinants	21	68	care	13	39	human mobility	14	18
transport	19	67	place	13	19	Disease	13	26
Scopus
Cluster 1			Cluster 2			Cluster 3			Cluster 4
Keyword	O	TLS	Keyword	O	TLS	Keyword	O	TLS	Keyword	O	TLS
activities	26	201	mobility	66	260	population dynamics	41	165	age	13	108
cognition	25	135	spatial analysis	33	156	Physiology	25	139	age factor	10	82
walking	24	152	neighborhood	23	126	growth, development and aging	18	29
mobility limitation	19	154	travel behavior	19	68	metabolism	16	38
gait	18	115	urban area	15	81	spatiotemporal analysis	16	45
walking difficulty	16	138	transportation	14	62	Migration	12	39
psychology	13	111	residence characteristics	12	108	Genetics	10	22
quality of life	12	79	socioeconomic factors	12	98	residential mobility	10	24
walking speed	12	83	built environment	11	73
disability	11	84	urban population	11	66