Epidemiology of ossification of the spinal ligaments and associated factors in the Chinese population: a cross-sectional study of 2000 consecutive individuals

Table 5 Previously reported prevalence of C-OPLL and T-OPLL

Type	Authors/reported year	Country	Race	Sample Size	Modality	Prevalence rate
Type	Authors/reported year	Country	Race	Sample Size	Modality	M (%)	F (%)	T (%)
C-OPLL	Firooznia et al. [39]/1984	USA	White	1000	Cervical x-ray	NA	NA	0.7
	Ohtsuka et al. [23]/1987	Japan	Asian	1058	x-ray	4.3	2.4	3.2
	Shingyouchi et a [18]/1996	Japan	Asian	4802	Cervical x-ray	NA	NA	4.1
	Kim et al. [25]/2008	Korea	Asian	11,774	Cervical x-ray	0.79	0.45	0.6
	Yoshimura et al. [24]/2014	Japan	Asian	1562	Cervical x-ray	3.2	1.3	1.9
	Sohn et al. [26]/2014	Korea	Asian	3240	Thyroid CT	8.8	4.2	5.7
	Fujimori et al. [15]/2015	USA	White	1593	Cervical CT	1.6	0.8	1.3
			Asian	624	Cervical CT	5.8	3.6	4.8
			Hispanic	472	Cervical CT	1.5	3.1	1.9
			Aframerican	326	Cervical CT	2.2	2.0	2.1
	Fujimori et al. [16]/2016	Japan	Asian	1500	PETCT	8.3	3.4	6.3
	Present study	China	Asian	2000	PETCT	4.12	4.06	4.10
T-OPLL	Ono et al. [32]/1982	Japan	Asian	8610	Chest x-ray	0.25	0.74	0.56
	Ohtsuka et al. [30]/1986	Japan	Asian	1058	x-ray	0.9	0.6	0.8
	Mori et al. [40]/2014	Japan	Asian	3013	Chest CT	1.0	3.0	1.9
	Fujimori et al. [16]/2016	Japan	Asian	1500	PETCT	1.4	2.0	1.6
	Present study	China	Asian	2000	PETCT	1.57	3.61	2.25

T total, M male, F female, C-OPLL ossification of the posterior longitudinal ligament of the cervical spine, T-OPLL ossification of the posterior longitudinal ligament of the thoracic spine, CT computed tomography, NA not available, PETCT positron emission tomography and computed tomography

ISSN: 1471-2474