Questionnaire-based study of COVID-19 vaccination induced headache: evidence of clusters of adverse events

BMC Neurology

Table 3 Absolute frequencies of AEs rating

AEs	N	L	A	Q	V	Sum
Pain at the injection site	603	222	268	183	126	1402
Fatigue	646	87	183	228	258	1402
Flu-like symptoms	851	106	107	137	201	1402
Headache	854	123	149	132	144	1402
Fever	1148	59	58	63	74	1402
Dizziness/balance problems	1181	75	58	52	36	1402
Redness	1188	122	56	17	19	1402
Circulatory weakness (dizzy/blackout)	1211	79	53	39	201	1402
Nausea/Vomiting	1274	49	36	25	181	1402
Known tension-type headache (triggering an attack within 24 h)	1298	205	15	37	32	1402
Diarrhea	1323	29	26	14	10	1402
Hematoma	1326	40	17	10	9	1402
Known migraine (triggering an attack within 24 h)	1347	12	7	14	22	1402

Not at all, Little, Average, Quite, Very: “N”, “L”, “A”, “Q”, “V”. Advent Events: AEs. Sum: Summary

ISSN: 1471-2377