Table I.

Summary of patient demographics and clinical characteristics.

Characteristic	Training set (n)	Testing set (n)	Total (n)
Sex
Female	19	20	39
Male	18	16	34
Age, years
≤55	19	20	39
>55	18	16	34
Vision and visual field disorders			0
Yes	18	28	46
No	19	8	27
Headache
Yes	18	18	36
No	19	18	37
Hypogonadism
Yes	2	8	10
No	35	28	63
Knosp classification
I	6	5	11
II	9	9	18
III	8	8	16
IV	14	14	28
Hardy classification
I	0	2	2
II	15	2	17
III	7	10	17
IV	15	0	15
Pathological type
Gonadotrophin	12	9	21
Mult	4	1	5
Null cell	21	25	46
Silent GH	0	1	1
Invasion
Yes	25	23	48
No	12	13	25

Mult, clinical non-functioning pituitary adenomas with multiple hormones positive immunostaining; GH, growth hormones.