Table 2.

Comparison of thickness and volume reduction differences at follow-up between spontaneous and traumatic cSDH groups. p < 0.05 was considered statistically significant.

Spontaneous–Traumatic cSDH Groups Differences	Mean Difference	95% CI		Significance (p < 0.05)
		Lower	Upper	T-Test	MWU *	ANCOVA	GLM *
T Difference at 1–3 Months (mm) *	−0.37	−5.13	4.40	0.438	0.910	0.145	0.119
V Difference at 1–3 Months (cm3) *	−1.68	−32.37	29.01	0.456	0.860	0.187	0.172
T Difference at 3–6 months (mm)	−7.32	−13	−1.63	0.007	0.044	0.329	0.536
V Difference at 3–6 Months (cm3)	−34.21	−74.07	5.63	0.044	0.048	0.559	0.670
T Difference at 6–12 Months (mm)	0.67	−8.84	10.18	0.44	0.626	0.253	0.138
V Difference at 6–12 Months (cm3)	18.46	−37.88	74.8	0.247	0.716	0.467	0.354

* GLM, generalized linear model MWU; Mann-Whitney U test; T, cSDH thickness; V, cSDH volume.