From: Chiropractic care and the risk of vertebrobasilar stroke: results of a case–control study in U.S. commercial and Medicare Advantage populations
Commercial
Medicare
DC visit with SMT
Any DC visit
Total # in sample
Stroke cases
13
19
1159
1
2
670
Controls
47
62
4633
21
24
2680
All
60
81
5792
22
26
3350