Table 3. Result of node selection for level 1 among all samples.

Node	number of p<0.001	number of p<0.01	number of p<0.05	number of p<0.1	number of p>0.1
N vs. rest	57	79	98	105	75
P1 vs. rest	0	17	39	51	129
P2 vs. rest	15	41	73	86	94
P3 vs. rest	28	52	68	83	97
N&P1 vs. rest	48	65	88	102	78
N&P2 vs. rest	29	51	71	86	94
N&P3 vs. rest	33	61	85	97	83

N: normal samples; P: CHF patients, in which 1 is of NYHA I-II, 2 is of NYHA III, 3 is of NYHA III-IV.