Table 2.

Logistic Regression of Associations Between Having Dizziness/Imbalance and Headaches Among Patients in Investigation for Possible ME/CFS

Explanatory Variables	Unadjusted OR (95% CI)	Adjusted OR (95% CI)	p-value (Adjusted)
C2 pain pattern*	8.17 (3.28–20.55)	6.50 (2.42–17.40)	0.00
C2 pain pattern**	3.76 (1.90–7.43)	3.15 (1.54–6.41)	0.00
Headache (no C2 pain pattern)*	2.17 (0.79–5.98)	2.13 (0.74–6.14)	0.16
Pain intensity		1.01 (0.99–1.02)	0.21
Body pain extent		1.00 (0.99–1.02)	0.52
Women		0.70 (0.31–1.61)	0.40
Age ≥60 years		1.20 (0.50–2.89)	0.68

Notes: Reference groups: *No headache n = 73. **Headache with no C2 pain pattern n = 86.