Table 1.

The demographical characteristics of primary GCT around the knee in China.

Categories	Male	Female	Total	P
Number, n (%)	178 (53.3)	158 (46.7)	334 (100)	–
Age, year, means(SD)	36.9 (13.5)	33.1 (12.1)	35.1 (13.0)	0.007
Age group, n (%)				0.118
<20	10 (5.6)	13 (8.3)	23 (6.9)
20~	53 (29.8)	65 (41.7)	118 (35.3)
30~	48 (27.0)	31 (19.9)	79 (23.7)
40~	37 (20.8)	26 (16.7)	63 (18.9)
≥50	30 (16.9)	21 (13.5)	51 (15.3)
Center, n (%)				0.831
Tianjin	34 (51.5)	32 (48.5)	66 (19.8)
Shandong	34 (61.8)	21 (46.6)	55 (16.5)
Xian	47 (53.4)	41 (46.6)	88 (26.3)
Jiangsu	18 (51.4)	17 (48.6)	35 (10.5)
Zhejiang	36 (50.0)	36 (50.0)	72 (21.6)
Inner Mongu	9 (50.0)	9 (50.0)	18 (5.4)