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. 2022 Aug 4;10:934106. doi: 10.3389/fpubh.2022.934106

Table 3.

Keyword co-occurrence frequency (Top 35 in count order, 2001–2021).

Keywords Count Centrality First appearance year
vitamin d 594 0.01 2001
infection 502 0.01 2001
d deficiency 424 0.07 2006
risk 364 0.04 2004
association 356 0.09 2001
expression 226 0.09 2001
disease 223 0.01 2001
d supplementation 211 0.01 2009
vitamin d deficiency 192 0.07 2001
children 181 0.11 2003
prevalence 181 0.02 2007
mycobacterium tuberculosis 158 0.1 2001
risk factor 147 0.01 2002
d receptor 146 0.01 2007
double blind 140 0.03 2010
hiv 130 0 2005
cell 129 0.22 2004
health 126 0 2009
prevention 124 0 2009
respiratory tract infection 121 0.01 2010
vitamin d receptor 121 0.06 2007
25 hydroxyvitamin d 117 0.09 2006
mortality 114 0.05 2006
receptor 94 0.02 2008
adult 93 0.03 2002
pulmonary tuberculosis 91 0.08 2002
immune response 89 0.03 2007
susceptibility 88 0.15 2002
tuberculosis 87 0.03 2004
t cell 87 0.01 2007
supplementation 86 0.01 2008
serum 25 hydroxyvitamin d 85 0.06 2008
inflammation 80 0.04 2010
therapy 79 0.04 2007
calcium 78 0.1 2001