Table 5.

Ratio of Odds Ratios for the Change in Headache Suffering from Baseline to the First 3 Months Post-Injury and 3-12 Months Post-Injury in the Three Participation Groups Related to Each Other

	First 3 months post-injury vs. baseline			3-12 months post-injury vs. baseline			3-12 months post-injury vs. first 3 months post-injury
	Ratio of OR	95% CI	P-value	Ratio of OR	95% CI	P-value	Ratio of OR	95% CI	P-value
MTBI vs. TC	4.33	1.50-12.47	0.007	1.71	0.57-5.15	0.342	0.39	0.13-1.17	0.093
MTBI vs. CC	3.56	1.09-11.66	0.036	1.21	0.43-3.42	0.719	0.34	0.10-1-13	0.078
TC vs. CC	0.82	0.20-3.32	0.784	0.71	0.19-2.68	0.612	0.86	0.21-3.60	0.837

Baseline: headache suffering last 12 months prior to injury (MTBI and TC) or first questionnaire (CC).

CC, healthy controls; CI, confidence interval; MTBI, mild traumatic brain injury; OR, odds ratio; TC, trauma controls.