Table 4.

Lymph Node Counts Stratified By Relevant Variables In The PS Group And PSI Group

	PS Group (N=59)	PSI Group (N=59)	P value
Lymph node counts	31.8±11.1	46.5±19.4	<0.001
Male	31.8±11	49±20	<0.001
Female	31.6±11.6	36.6±13.7	0.297
Age<60	32.5±11.3	39.4±19.4	0.381
Age≥60	31±10.9	51±18.3	<0.001
BMI<27	32.2±11.3	47.9±20.4	<0.001
BMI≥27	28.8±9.3	41.1±14.4	0.047
Surgeon’s experience (≥15 years)	31.7±11.6	44.6±19.6	0.002
Surgeon’s experience (<15 years)	31.9±9	52.8±18.1	0.002
Gastrectomy selection
Subtotal	30±11.3	42±16.5	0.001
Total	34.4±10.4	51.9±21.6	0.001
Mode of operation
Open	31±11.4	44.8±19.5	0.004
Laparoscopic	32.4±10.9	47.8±19.6	<0.001
Tumor location
Upper third	27.2±8.6	52.2±23.4	0.001
Median third	32.6±11.6	46.2±18.4	0.028
Lower third	33.2±11.4	43.4±17.2	0.034
T stage
T1	27.5±11.8	40.8±18.2	0.073
T2	31.7±10.7	48.1±19.4	0.018
T3	33±11.8	47.5±19.8	0.002
T4	32.4±4.7	46.7±22.9	0.191
N stage
N0	27.1±8.8	42.9±20.8	0.002
N1	28.2±6.5	48.9±20.6	0.017
N2	33.7±13.5	39.1±11.8	0.41
N3	36.9±11.7	52.2±18.9	0.008
Pathological stage
Ⅰ	27.4±10.5	44.1±19.8	0.016
Ⅱ	30.1±9.4	48.2±21.6	0.009
Ⅲ	34.9±11.9	47.1±18.7	0.02

Abbreviation: BMI, body mass index.