Table 4.

The distribution of ossified cervical vertebrae of OPLL patients in each subgroup classified by “A” allele of the Ser87Ser (A/G)

Group 1 = A allele (+)		Group 2 = A allele (−)
Number of OPLL patients	Number of ossified cervical vertebrae	Number of OPLL patients	Number of ossified cervical vertebrae
1	2	1	1
2	2	2	2
3	2	3	3
4	1	4	1
5	2	5	3
6	1	6	6
7	2	7	2
8	1	8	5
9	2	9	3
10	2	10	6
11	2	11	2
12	2	12	3
13	2	13	3
14	1	14	3
15	2	15	2
		16	3
		17	2
		18	1
		19	7
		20	7
		21	3
		22	4
		23	3
		24	1
		25	3
		26	3
		27	4
		28	2
		29	3
		30	3
		32	1
		33	3
		34	5
		35	3
		36	7
		37	2
		38	1