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Table 3 Comparison of baseline characteristics according to receipt of colonoscopy – Restricted cohort vs. PS Matched cohort

From: Methodological approaches to population based research of screening procedures in the presence of selection bias and exposure measurement error: colonoscopy and colorectal cancer outcomes in Ontario

  All patients Restricted cohort    Propensity Matched sample  
   No colonoscopy Yes colonoscopy   Standardized difference No colonoscopy Yes colonoscopy   Standardized difference
Characteristics   (%) (%) P value   (%) (%) P value  
# of patients 1,089,998 1,003,161 86,837    86,592 86,592   
Female patients 591,431 (54.3) 543,040 (54.1) 48,391 (55.7) <.001 3.22% 48,207 (55.7) 48,252 (55.7) 0.82 0.00%
Patient age group     <.001     0.62  
50-59 461,161 (42.3) 425,29 1 (42.4) 35,870 (41.3)   2.23% 35,695 (41.2) 35,775 (41.3)   0.20%
60-69 379,961 (34.9) 344,492 (34.3) 35,469 (40.9)   13.66% 35,289 (40.8) 35,365 (40.8)   0.00%
70-74 248,876 (22.8) 233,378 (23.3) 15,498 (17.9)   13.38% 15,608 (18.0) 15,452 (17.8)   0.52%
Income quintile     <.001     0.75  
01 187,006 (17.2) 173,598 (17.3) 13,408 (15.1)   5.97% 13,230 (15.3) 13,407 (15.5)   0.55%
02 219,705 (20.1) 203,403 (20.3) 16,302 (18.7)   4.04% 16,378 (18.9) 16,300 (18.8)   0.26%
03 220,765 (20.3) 203,512 (20.3) 17,253 (19.9)   1.00% 17,326 (20.0) 17,251 (19.9)   0.25%
04 219,289 (20.1) 201,626 (20.1) 17,663 (20.5)   0.99% 17,587 (20.3) 17,663 (20.4)   0.25%
05 240,663 (22.1) 218,691 (21.8) 21,972 (25.7)   9.17% 22,071 (25.5) 21,971 (25.4)   0.23%
Missing 2,570 (0.3) 2,331 (0.2) 239 (0.3)       
Rural area of residence 149,199 (13.7) 136,594 (13.6) 12,605 (14.5) <.001 2.59% 11,262 (13.0) 12,434 (14.4) <.001 4.07%
Co-morbidities     <.001     0.13  
Not hospitalized Hospitalized but no comorbidities 519,817 (47.7) 514,294 (51.3) 5,523 (6.4)   114.09% 5,516 (6.4) 5,516 (6.4)   0.00%
  401,168 (36.8) 337,586 (33.6) 63,582 (73.2)   86.49% 63,752 (73.6) 63,415 (73.2)   0.91%
At least one comorbidity 169,013 (15.5) 151,281 (15.1) 17,732 (20.4)   13.90% 17,324 (20.0) 17,661 (20.4)   1.00%
  1. Data are presented as number (percentage). Standardized difference is the mean difference divided by the pooled SD, expressed as a percentage.