Table 1.

Subject Characteristics

Cohort	Chiropractic	Primary Care	Difference (A-B)	95% CI
Subjects	733,321	385683	347,638
Office Visits for Neck Pain	7,041,912	608,374	6,433,538
Subjects with Stroke	3,773	1,069	2,704
Age in Years
% 66–69	29.27	24.25	5.02 †	4.84; 5.19
% 70–74	29.16	25.45	3.71 †	3.54; 3.88
% 75–79	21.46	21.99	−0.53 †	−0.69; −0.37
% 80–84	12.83	16.22	−3.39 †	−3.52; −3.25
% 85–99	7.27	12.08	−4.80 †	−4.92; −4.39
% Male	38.77	33.57	5.20 †	5.02; 5.39
Race
% White	96.62	86.98	9.63 †	9.54; 9.74
% Black	1.41	6.98	−5.56 †	−5.64; −5.47
% Other	1.96	6.04	−4.08 †	−4.15; −4.01
Mean Charlson Comorbidity Score	0.92	1.29	−0.37 †	−0.38; −0.36

^*CI = confidence interval;

^†p<0.05