Risk of Guillain-Barré Syndrome Among Older Adults Receiving Influenza Vaccine in Taiwan.

The results of subgroup analysis for CCI did not reach statistical significance even though the IRRs among the high-CCI (≥2) group were all greater than 1 (days 1-7, 1.12 [95% CI, 0.61-2.05; P = .72]; days 1-14, 1.01 [95% CI, 0.64-1.62; P = .95]; days 1-42, 1.03 [95% CI, 0.77-1.38; P = .84]) and those among the low-CCI (<2) group were all less than 1 (days 1-7, 0.51 [95% CI, 0.16-1.60; P = .25]; days 1-14, 0.62 [95% CI, 0.29-1.32; P = .22]; days 1-42, 0.75 [95% CI, 0.49-1.13; P = .17]).

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