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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.