Table 8.

Top 20 keywords in terms of frequency and centrality in the study of NSLBP from 2000 to 2018.

Ranking	Keyword	Frequency	Keyword	Centrality
1	Low back pain	482	Follow up	0.99
2	Disability	214	Low back pain	0.95
3	Randomized controlled trial	180	Randomized controlled trial	0.75
4	Management	177	Risk factor	0.58
5	Primary care	171	Prognosis	0.52
6	Questionnaire	107	Reliability	0.36
7	reliability	107	management	0.35
8	Clinical trial	100	Intervention	0.32
9	Exercise	99	Adolescent	0.32
10	Rehabilitation	92	Strength	0.32
11	Therapy	70	Epidemiology	0.28
12	Risk factor	68	Balance	0.27
13	Guideline	68	Metaanalysis	0.25
14	Prevalence	67	Exercise	0.23
15	Follow up	66	Nonsteroidal antiinflammator	0.22
16	Lumbar spine	65	Questionnaire	0.20
17	Physical therapy	55	Prevalence	0.18
18	Metaanalysis	54	Rehabilitation	0.16
19	Back pain	50	Coordination	0.15
20	Classification	46	Placebo controlled trial	0.14