Table 1.

Clinical findings of the recurrence and non-recurrence groups

Factor		Recurrence (n = 3)	Non-recurrence (n = 67)	Recurrence rate (%)	Odds ratio	95% CI	P-value
Age	Mean ± SD (years)	75.7 ± 2.9	76.3 ± 12.5	–	–	–	0.5
	Range	74–79	29–95
Sex	Male	2	50	4.0	0.68	0.1–5.4	0.75
	Female	1	17	5.6
Chief complaint	Headache	0	10	0.0	0.78†	0.07–9.4	0.10
	Cognitive impairment	0	12	0.0	0.63†	0.06–7.5	0.14
	Disturbance of consciousness	1	7	14.2	4.2	0.5–38	0.31
	Hemiparesis or walking difficulty	1	34	2.9	0.48	0.06–3.9	1
	Others (aphasia, convulsion, dizziness, vomiting)	1	4	20.0	7.8	0.8–79	0.202
Days from trauma to operation	Mean ± SD (days)	19 ± 17	53.1 ± 34.1	–	–	–	0.08
	Range	7–31 (n = 2)	3–180 (n = 41)
Excessive alcohol consumption	+	0	7	0.0	1.1†	0.1–14	0.38
	−	3	60	4.8
Antithrombotic drug	+	2	20	9.0	3.0	0.33–25	0.56
	−	1	47	2.1
Laterality	Left	2	18	10	5.4	0.6–44	0.19
	Right	1	24	4.0	0.9	0.1–7.3	1
	Bilateral	0	25	0.0	0.3†	0.02–2.9	0.29
Midline shift	Mean ± SD (cm)	13.8 ± 9.3	7.3 ± 4.57	–	–	–	0.71
	Range	0–18.6	0–17.9
Thickness of hematoma	Mean ± SD (cm)	23.9 ± 8.6	23.7 ± 5.9	–	–	–	0.89
	Range	14–29	8.4–40
Density of hematoma	Low	1	14	6.6	1.9	0.23–16	0.61
	Iso	1	28	3.5	0.7	0.09–5.6	1
	High	0	5	0.0	1.6†	0.1–21	0.30
	Varying or mixed	1	20	4.7	1.2	0.2–9.6	1
Niveau	+	1	8	11.1	3.7	0.4–33	0.34
	−	2	59	3.2
Endoscopic findings	Trabecula	2	51	5.6	0.63	0.08–5.1	0.57
	Septum	0	27	0.0	0.2†	0.1–2.4	0.29
	Inner clot	2	30	6.2	2.7	0.3–19	0.58
	Outer clot	2	52	4.7	0.57	0.07–4.6	0.55
	Tear of arachnoid mater	0	2	0.0	3.7†	0.3–56	0.16
Color of inner membrane	Red	3	30	10.0	0.1†	0.01–1.3	0.11
	Yellow	0	37	0.0
Color of outer membrane	White	3	18	14.2	18†	1.6–206†	0.007*
	Red	0	24	0.0	0.25†	0.02–2.9	0.29
	Yellow	0	25	0.0	0.23†	0.02–2.9	0.29

^*P <0.05.

^†Adjusted odds ratio. CI: confidence interval, SD: standard deviation.