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Table 1 Baseline characteristics before and after PSM

From: The short-term and oncologic outcomes of younger VS older colorectal cancer patients undergoing primary surgery: a propensity score matching analysis

Characteristics

Before PSM

After PSM

Younger (403)

Older (4196)

P value

Younger (401)

Older (401)

P value

Age (year)

39.4 ± 5.4

65.1 ± 10.0

<0.001*

39.5 ± 5.4

63.2 ± 9.8

<0.001*

Sex

  

0.379

  

0.567

  Male

229 (56.8%)

2479 (59.1%)

 

228 (56.9%)

236 (58.9%)

 

  Female

174 (43.2%)

1717 (40.9%)

 

173 (43.1%)

165 (41.1%)

 

BMI (kg/m2)

22.8 ± 3.4

22.7 ± 3.2

0.323

22.8 ± 3.3

22.6 ± 3.2

0.325

Smoking

144 (35.7%)

1611 (38.4%)

0.293

143 (35.7%)

149 (37.2%)

0.660

Drinking

113 (28.0%)

1310 (31.2%)

0.187

112 (27.9%)

113 (28.2%)

0.937

Hypertension

22 (5.5%)

1169 (21.8%)

<0.001*

22 (5.5%)

24 (6.0%)

0.761

T2DM

7 (1.7%)

567 (13.5%)

<0.001*

7 (1.7%)

3 (0.7%)

0.203

CHD

1 (0.2%)

189 (4.5%)

<0.001*

1 (0.2%)

2 (0.5%)

1.000

Tumor location

  

0.235

  

0.724

  Colon

201 (49.9%)

1963 (46.8%)

 

199 (49.6%)

194 (48.4%)

 

  Rectum

202 (50.1%)

2233 (53.2%)

 

202 (50.4%)

207 (51.6%)

 

Tumor stage

  

0.988

  

0.947

  I

75 (18.6%)

790 (18.8%)

 

75 (18.7%)

72 (18.0%)

 

  II

165 (40.9%)

1736 (41.4%)

 

165 (41.1%)

171 (42.6%)

 

  III

146 (36.3%)

1485 (35.4%)

 

144 (35.9%)

139 (34.7%)

 

  IV

17 (4.2%)

185 (4.4%)

 

17 (4.3%)

19 (4.7%)

 
  1. Note: Variables are expressed as the mean ± SD, n (%), *P-value <0.05.
  2. Abbreviations: T2DM type 2 diabetes mellitus; BMI body mass index; PSM propensity score matching; CHD coronary heart disease.