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Table 1 Correlation of neurological symptoms with each factors

From: Symptomatic small schwannoma is a risk factor for surgical complications and correlates with difficulty of enucleation

	Spontaneous pain		X² test	Logistic analysis
	Y	N	P value	OR	95 % CI	P value
(a)
Gender
Male	16	58	0.394	0.725	0.307–1.713	0.463
Female	16	41	0.394	1
Age (years)
≥50	15	52	0.578	0.706	0.297–1.678	0.431
<50	17	47	0.578	1
Location
Extremity	31	82	0.045	4.388	0.530–36.331	0.17
Trunk	1	17	0.045	1
Nerve origin
Major	20	52	0.324	1.548	0.624–3.840	0.346
Minor	12	47	0.324	1
Muscular location
Intermuscle	23	81	0.227	0.47	0.170–1.296	0.144
Intramuscle	9	18	0.227	1
Neuro-location
Peripheral	27	79	0.567	1
Central	5	20	0.567	0.794	0.251–2.509	0.694
Volume (cm³)
<4	20	40	0.029	2.141	0.893–5.131	0.088
≥4	12	59	0.029	1
Total	32	99

	Tenderness		X² test	Logistic analysis
	Y	N	P value	OR	95 % CI	P value
(b)
Gender
Male	30	44	0.327	0.693	0.332–1.447	0.329
Female	28	29	0.327	1
Age (years)
≥50	26	41	0.197	0.536	0.255–1.126	0.1
<50	32	32	0.197	1
Location
Extremity	53	60	0.129	2.221	0.692–7.134	0.18
Trunk	5	13	0.129	1
Nerve origin
Major	34	38	0.453	1.288	0.596–2.782	0.519
Minor	24	35	0.453	1
Muscular location
Intermuscle	46	58	0.984	0.835	0.335–2.082	0.698
Intramuscle	12	15	0.984	1
Neuro-location
Peripheral	46	60	0.677	1
Central	12	13	0.677	1.216	0.472–3.131	0.686
Volume (cm³)
<4	28	32	0.612	1.023	0.487–2.152	0.951
≥4	30	41	0.612	1
Total	58	73

	Tinel sign		X² test	Logistic analysis
	Y	N	P value	OR	95 % CI	P value
(c)
Gender
Male	42	32	0.592	0.674	0.264–1.721	0.409
Female	35	22	0.592	1
Age (years)
≥50	42	25	0.353	1.424	0.574–3.534	0.446
<50	35	29	0.353	1
Location
Extremity	73	40	0.001	3.683	0.933–14.538	0.063
Trunk	4	14	0.001	1
Nerve origin
Major	55	17	<0.001	4.67	1.846–11.816	0.001
Minor	22	37	<0.001	1
Muscular location
Intermuscle	66	38	0.033	1.914	0.647–5.663	0.241
Intramuscle	11	16	0.033	1
Neuro-location
Peripheral	56	50	0.004	1
Central	21	4	0.004	3.772	1.018–13.984	0.047
Volume (cm³)
<4	47	13	<0.001	6.594	2.487–17.480	<0.001
≥4	30	41	<0.001	1
Total	77	54

	Numbness		X² test	Logistic analysis
	Y	N	P value	OR	95 % CI	P value
(d)
Gender
Male	19	55	0.338	0.601	0.244–1.479	0.268
Female	19	38	0.338	1
Age (years)
≥50	21	46	0.547	1.072	0.442–2.600	0.878
<50	17	47	0.547	1
Location
Extremity	35	78	0.214	1.52	0.344–6.720	0.581
Trunk	3	15	0.214	1
Nerve origin
Major	30	42	<0.001	3.04	1.157–7.989	0.024
Minor	8	51	<0.001	1
Muscular location
Intermuscle	36	68	0.006	4.581	0.954–21.996	0.057
Intramuscle	2	25	0.006	1
Neuro-location
Peripheral	23	83	<0.001	1
Central	15	10	<0.001	4.209	1.517–11.681	0.006
Volume (cm³)
<4	20	40	0.316	1.611	0.654–3.971	0.3
≥4	18	53	0.316	1
Total	38	93

	Postoperative deficits		X² test	Logistic analysis
	Y	N	P value	OR	95 % CI	P value
(e)
Gender
Male	13	61	0.585	0.824	0.226–3.001	0.769
Female	8	49	0.585	1
Age (years)
≥50	9	58	0.407	0.479	0.137–1.670	0.248
<50	12	52	0.407	1
Location
Extremity	17	96	0.441	0.171	0.026–1.132	0.067
Trunk	4	14	0.441	1
Nerve origin
Major	16	56	0.033	3.92	0.860–17.861	0.078
Minor	5	54	0.033	1
Muscular location
Intermuscle	17	87	0.847	0.228	0.046–1.138	0.071
Intramuscle	4	23	0.847	1
Neuro-location
Peripheral	7	99	<0.001	1
Central	14	11	<0.001	32.04	7.566–135.704	<0.001
Volume (cm³)
<4	12	48	0.255	3.742	0.989–14.160	0.052
≥4	9	62	0.255	1
Total	21	110

Y yes, N no, OR odds ratio, CI confidential interval

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