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Table 4 Chiropractic and PCP visits prior to the index date (Commercial)

From: Chiropractic care and the risk of vertebrobasilar stroke: results of a case–control study in U.S. commercial and Medicare Advantage populations

Exposures All Age <45 yr Age ≥45 yr
Cases (n = 1159) Controls (n = 4633) Cases (n = 98) Controls (n = 392) Cases (n = 1061) Controls (n = 4241)
Most recent DC Visit
0-1 day: n (%) 3 (0.3) 11 (0.2) * * 3 (0.3) 11 (0.3)
0-3 days: n (%) 6 (0.5) 21 (0.5) * 1 (0.3) 6 (0.6) 20 (0.5)
0-7 days: n (%) 8 (0.7) 31 (0.7) * 1 (0.3) 8 (0.8) 30 (0.7)
0-14 days: n (%) 9 (0.8) 44 (0.9) * 3 (0.8) 9 (0.8) 41 (1.0)
0-30 days: n (%) 19 (1.6) 62 (1.3) 2 (2.0) 7 (1.8) 17 (1.6) 55 (1.3)
Most recent PCP Visit
1-1 day: n (%) 41 (3.5) 15 (0.3) 4 (4.1) 1 (0.3) 37 (3.5) 14 (0.3)
1-3 days: n (%) 78 (6.7) 41 (0.9) 8 (8.2) 2 (0.5) 70 (6.6) 39 (0.9)
1-7 days: n (%) 115 (9.9) 93 (2.0) 10 (10.2) 4 (1.0) 105 (9.9) 89 (2.1)
1-14 days: n (%) 157 (13.5) 165 (3.6) 12 (12.2) 15 (3.8) 145 (13.7) 150 (3.5)
1-30 days: n (%) 219 (18.9) 316 (6.8) 23 (23.5) 29 (7.4) 196 (18.5) 287 (6.8)
  1. *Insufficient data to compute an estimate.