Table 2.

Clinical and laboratory features, which showed significant different frequencies between the very young (< 40 years old) and the young (40 to < 50 years old) patients

Factor	Age category		P
	Younger than 40 y	40 to younger than 50 y
Male	208/312 (67)	815/1377 (59)	.015
Performance status 2+	87/296 (29)	475/1286 (37)	.014
ISS stage II	63/219 (29)	375/1048 (36)	.047
Durie-Salmon subtype A	252/310 (81)	1170/1366 (86)	.053
Platelets less than 130 × 109/L	36/247 (15)	116/1173 (10)	.030

Data are number with factor/number with valid data for factor (%)