Association of vitamin D in individuals with periodontitis: an updated systematic review and meta-analysis

BMC Oral Health

Table 1 Basic information of the included literature

Study	Study time	Country	Age	Gender (male/female)	No. of case/control	Sample size	Study design
Olszewska-Czyz, I 2022 [17]	NM	Poland	25–62	49/51	50/50	100	Case–control
Costantini, E 2020 [22]	NM	Italy	25–60	14/28	21/21	42	Case–control
Abreu, O 2016 [30]	2014.05–2014.07	Puerto Rican	35–64	10/28	19/19	38	Case–control
Alzahrani, A 2021 [31]	2020.01–2020.11	Saudi Arabia	40.01 ± 7.73	46.3%/53.7%	60/63	123	Case–control
Anbarcioglu, E 2019 [32]	2012–2013	Turkey	21–47	58/71	47/55/27	129	Case–control
Gao, W 2020 [33]	2014.12–2015.06	China	30–70	178/182	120/120/120	360	RCT
Ketharanathan, V 2019 [34]	NM	Tamil and Norway	30–70	92/0	44/48	92	Case–control
Laky, M 2017 [35]	2008–2010	Vienna	28–42	20/38	29/29	58	Case–control
Liu, K 2010 [36]	2006.11–2007.02	China	16–34	8/11	19	19(12)	Non-RCT
Miley, D 2009 [37]	2007.06—2008.02	America	50–80	6/16/17/12	23/28	51	Cross-sectional
Miricescu, D 2014 [38]	NM	Romania	51.26 ± 7.4	16/34	25/25	50	Case–control
Pai, S 2021 [39]	NM	India	30–60	NM	30/30	60	Non-RCT
Perayil, J 2015 [40]	2012.11—2013.12	India	35–55	NM	36/41	77	Non-RCT
Perić, M 2020 [41]	2017.04–2018.10	Brussels	NM	19/7	12/14	26(21)	RCT
Pradhan, S 2021 [42]	2019.02–2019.08	Nepal	25–54	56/24	40/40	80	Cross-sectional
Rafique, S 2019 [43]	NM	Pakistan	18–40	44%/56%	75/75	150	Case–control

NM not mentioned, RCT randomized controlled trial, Non-RCT non-randomized controlled trial

ISSN: 1472-6831