Table 1. Summary of baseline characteristics of intradural extramedullary tumor patients.

Groups	N	Age (year)	Male/Female	Course of disease(mouth)
MIS group	53	41.15±14.73	29/24	32.45±6.81
Non-MIS group	69	43.25±16.42	37/32	30.67±5.28
Group A	19	42.84±11.25	11/8	28.25±8.14
Group B	34	41.42±13.47	16/18	29.53±8.75
Group C	24	40.26±15.08	14/10	33.67±7.99
Group D	18	43.71±12.23	10/8	30.73±7.43
Group E	27	43.54±14.67	15/12	31.84±6.58
Group HE	43	40.87±12.54	21/22	29.72±4.73
Group LE	18	41.62±13.75	10/8	34.91±7.54
Group LESPF	61	43.92±15.68	35/26	33.14±9.36

There was no significant difference between the MIS group and Non-MIS group (p>0.05). This was the same among the five groups (Group A, Group B, Group C, Group D, Group E; p>0.05) and among the three groups (Group HE, Group LE, Group LESPF; p>0.05). Data are expressed as the mean ± standard deviation.