Table 1. Characteristics of the included studies.

Author, Year	Continent	Diagnosis	Risk of bias	N	Prevalence (%)	Type of dental health care personnel
Macdonald et al. 1988	NA	SR	L	2464	8.69	DA
Osborn et al. 1990	NA	SR	M	394	6.85	DA
Conrad et al. 1991	NA	V	L	20	0.00	DA
Conrad et al. 1992	NA	V	M	16	0.00	DA
Conrad et al. 1993	NA	V	L	16	0.00	DA
Nakladalova et al. 1995	Eu	NC	M	120	3.33	DA
Liss et al. 1995	NA	SR	M	1058	10.21	DA
Scoggins and Campbell 1995	NA	SR	M	79	5.06	DA
Rice et al. 1996	NA	PE	L	45	11.11	Mixed
Akesson et al. 1999	Eu	PE	L	84	7.14	Mixed
Lalumandier et al. 2000	NA	SR	L	5115	25.45	Mixed
Hamann et al. 2001	NA	NC	L	1079	4.82	D
Anton et al. 2002	NA	NC	L	89	8.99	DA
Werner et al. 2002	NA	NC	L	305	5.57	DA
Mamatha et al. 2005	Asia	SR	L	300	32.00	D
Werner et al. 2005	NA	NC	L	232	0.43	D
Werner et al. 2005b	NA	SR	L	111	0.90	DA
Cherniack et al. 2006	NA	PE	L	160	12.50	DA
Greathouse et al. 2009	NA	NC	L	35	25.71	DA
Shaffer et al. 2012	NA	NC	L	55	10.91	DA
Haghighat et al. 2012	Asia	PE	L	240	16.67	D
Borhan et al. 2013	Asia	NC	L	40	17.50	D
Khan et al. 2014	Asia	SR	L	417	10.31	D
Pai et al. 2014	Asia	SR	L	210	20.00	D
Munirah et al. 2014	Asia	SR	M	99	21.21	D
Hodacova et al. 2015	Eu	SR	M	575	14.61	D
Nor Rasid et al. 2016	Asia	SR	L	95	38.95	DA
Ehsan et al. 2016	Asia	PE	L	103	15.53	D
Prasad et al. 2017	Asia	SR	L	100	86.00	D
Jaoude et al. 2017	Asia	SR	L	314	7.64	D
De JeSUS et al. 2018	SA	SR	L	286	13.29	D
Inbasekharan et al. 2018	Asia	SR	L	120	25.83	D
Alhusain et al. 2019	Asia	SR	L	223	30.49	D
Meisha et al. 2019	Asia	SR	L	234	9.40	D
Al Muraikhi et al. 2020	Asia	SR	L	66	24.24	D
Harris et al. 2020	NA	SR	L	647	18.39	DA
Berdouses et al. 2020	Eu	SR	L	1500	8.27	D
Maghsoudipour et al. 2021	Asia	NC	L	106	17.92	D

NA: North America; SA: South America; Eu: Europe; SR: self-reported; NC: Nerve conduction; PE: Physical examination; V: Vibrometry; DA: Dental Auxilaries; D: Dentists/dental students; N: sample size; Mixed: Dental Auxiliaries or Dentists/dental students.