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Table 1 Descriptive characteristics for patients included in the HRQoL study group (n = 376) and those who were not included but were registered in the local and national protocol (n = 185)

From: Risk factors for poor health-related quality of life in patients with colon cancer include stoma and smoking habits

Variable Included (n = 376) Not included (n = 185) P value
Value Missing, n (%) Value Missing, n (%)
Male sex, n (%) 180 (47.9) 0 (0.0) 89 (48.1) 0 (0.0) 0.858a
Age (years), mean (SD) 73.3 (10.9) 0 (0.0) 73.6 (13.2) 0 (0.0) 0.777b
Current smoker, n (%) 34 (9) 16 (4.3) 12 (6.5) 55 (29.7) 0.943a
BMI (kg/m2), mean (SD) 26.6 (4.4) 4 (1.1) 25.8 (5.6) 11 (5.9) 0.120b
ASA status, n (%)   0 (0.0)   4 (2.2) < 0.001a
 1 43 (11.4)   10 (5.5)   
 2 185 (49.2)   76 (42.0)   
 3 134 (35.6)   78 (43.1)   
 4 14 (3.7)   17 (9.4)   
Operated, n (%) 343 (91.2) 0 (0.0) 135 (73.0) 0 (0.0) < 0.001a
Emergency surgery, n (%) 59/343 (17.2) 0 (0.0) 80/135 (59.2) 0 (0.0) < 0.001a
Operation type   0 (0.0)   0 (0.0) < 0.001a
 No resection 16/343 (4.7)   25/135 (18.5)   
 Right-sided operation 191/343 (55.7)   59/135 (43.7)   
 Left-sided operation 117/343 (34.1)   36/135 (26.7)   
 Colectomy 19/343 (5.5)   14/135 (10.4)   
 Laparotomy 0/343 (0.0)   1/135 (0.7)   
Stoma   0 (0.0)   0 (0.0) < 0.001a
 Yes, with resection 89/343 (25.9)   51/135 (37.8)   
 Yes, without resection 14/343 (4.1)   28/135 (20.7)   
 No 240/343 (70.0)   56/135 (41.4)   
TNM stadium, n (%)   0 (0.0)   1 (0.5) < 0.001a
 1 37 (9.8)   20 (10.8)   
 2 155 (41.2)   45 (24.3)   
 3 131 (34.8)   39 (21.6)   
 4 53 (14.1)   79 (42.7)   
 x    1 (0.6)   
  1. Sums of percentages may differ from 100 due to rounding
  2. P values from tests of differences between included and not included individuals using aPearson’s χ2 test and bWelch’s independent samples t-test. Significant P values are given in bold
  3. ASA American Society of Anesthesiologists, BMI body mass index, HRQoL health-related quality of life, SD standard deviation, TNM tumour–node–metastasis