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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.