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 |