. Author manuscript; available in PMC: 2018 Jun 15.

Published in final edited form as: Spine (Phila Pa 1976). 2017 Jun 15;42(12):921–929. doi: 10.1097/BRS.0000000000001965

Table 1.

Demographics of the total population

Variables	Min	Max	Median	Mean	Std	IQR
Age	18	96	56	54.2	16.81	41-67

		N	%
Race	White or Caucasian	1414	89.72
	Black or African American	22	1.40
	American Indian and Alaska Native	11	0.70
	Native Hawaiian and Other Pacific Islander	5	0.32
	Asian	17	1.08
	Other	107	6.79
	Missing	31
Ethnicity	W	1467	93.92
	H	95	6.08
	Missing	45
Gender	Male	765	47.60
	Female	842	52.40