Table 1 Baseline characteristics before and after propensity score matching by multidisciplinary assessment group

From: The effect of selection and referral biases for the treatment of localised prostate cancer with surgery or radiation

 

Before matching

After matching

 

RadOnc (n = 7079)

Urologist alone (n = 9587)

standardised difference

RadOnc (n = 5708)

Urologist alone (n = 5708)

standardised difference

Demographics

Age (median, IQR)

67 (62–73)

65 (59–71)

0.22

67 (61–72)

66 (61–72)

0.01

Index year (n, %)

  

0.07

  

0.00

2010

2150 (30.4)

3038 (31.7)

 

1806 (31.6)

1806 (31.6)

 

2011

2506 (35.4)

3484 (36.3)

 

2065 (36.2)

2065 (36.2)

 

2012

1699 (24.0)

2321 (24.2)

 

1377 (24.1)

1377 (24.1)

 

2013

724 (10.2)

744 (7.8)

 

460 (8.1)

460 (8.1)

 

Income quintile (n, %)

  

0.03

  

0.00

1 (lowest)

985 (14.3)

1449 (15.1)

 

852 (14.9)

852 (14.9)

 

2

1234 (17.7)

1755 (18.3)

 

1034 (18.1)

1034 (18.1)

 

3

1383 (19.5)

1876 (19.6)

 

1086 (19.0)

1086 (19.0)

 

4

1619 (22.5)

2124 (22.2)

 

1271 (22.3)

1271 (22.3)

 

5 (highest)

1832 (25.6)

2353 (24.5)

 

1465 (25.7)

1465 (25.7)

 

Missing

26 (0.4)

30 (0.3)

 

0

0

 

Geographic region (n, %)

  

0.08

  

0.01

Region 1

333 (4.7)

425 (4.4)

 

281 (4.9)

287 (5.0)

 

Region 2

605 (8.5)

822 (8.6)

 

518 (9.1)

528 (9.3)

 

Region 3

254 (3.6)

542 (5.7)

 

217 (3.8)

224 (3.9)

 

Region 4

824 (11.6)

1348 (14.1)

 

725 (12.7)

696 (12.2)

 

Region 5

298 (4.2)

521 (5.4)

 

259 (4.5)

263 (4.6)

 

Region 6

481 (6.8)

825 (8.6)

 

421 (7.4)

431 (7.6)

 

Region 7

465 (6.6)

679 (7.1)

 

410 (7.2)

406 (7.1)

 

Region 8

911 (12.9)

1103 (11.5)

 

755 (13.2)

733 (12.8)

 

Region 9

783 (11.1)

1213 (12.7)

 

689 (12.1)

726 (12.7)

 

Region 10

322 (4.5)

390 (4.1)

 

274 (4.8)

260 (4.6)

 

Region 11

1045 (14.8)

713 (7.4)

 

560 (9.8)

528 (9.3)

 

Region 12

257 (3.6)

424 (4.4)

 

224 (3.9)

231 (4.0)

 

Region 13

339 (4.8)

476 (5.0)

 

299 (5.2)

315 (5.5)

 

Region 14

154 (2.2)

100 (1.0)

 

76 (1.3)

80 (1.4)

 

Tumour-related factors

Prostate cancer risk (n, %)

  

0.31

  

0.00

Low risk

1029 (14.5)

2591 (27.0)

 

909 (15.9)

909 (15.9)

 

Not low risk

6050 (85.5)

6996 (73.0)

 

4799 (84.1)

4799 (84.1)

 

Serum PSA level

      

Median (ng/mL) (IQR)

7 (5-11)

6 (5–9)

0.27

7 (5-11)

7 (5-10)

0.16

Categorical

  

0.21

  

0.11

 <10 ng/mL

4957 (70.0)

7583 (79.1)

 

4066 (71.2)

4334 (75.9)

 

 ≥10 ng/mL

2122 (30.0)

2004 (20.9)

 

1642 (28.8)

1374 (24.1)

 

Gleason score (n, %)

  

0.35

  

0.18

≤6

1892 (26.7)

4717 (49.2)

 

1619 (28.4)

2331 (40.8)

 

7

3810 (53.8)

3934 (41.0)

 

3046 (53.4)

2714 (47.5)

 

≥8

1377 (19.5)

936 (9.8)

 

1043 (18.3)

663 (11.6)

 

Stage (n, %)

  

0.29

  

0.10

1

1069 (15.1)

2731 (28.5)

 

943 (16.5)

1002 (17.6)

 

2

5092 (71.9)

5410 (56.4)

 

4028 (70.6)

3734 (65.4)

 

3

918 (13.0)

1446 (15.1)

 

737 (12.9)

972 (17.0)

 

General medical care

Number of GP visits in year prior to diagnosis (median, IQR)

5 (3–9)

5 (3–9)

0.06

5 (3–9)

5 (3–9)

0.00

hospitalisation in year prior to diagnosis (n, %)

463 (6.5)

617 (6.4)

0.00

347 (6.1)

346 (6.1)

0.00

Ever resident of long-term care prior to diagnosis (n, %)

6 (0.1)

12 (0.3)

0.01

<5

<5

0.01

Comorbidity

RUB score (n, %)

  

0.02

  

0.01

0

<5

<5

 

0

<5

 

1

<5

2–6

 

<5

<5

 

2

250 (3.5)

403 (4.2)

 

215–219

205 (3.6)

 

3

4455 (62.9)

6162 (64.3)

 

3678 (64.4)

3673 (64.3)

 

4

1574 (22.2)

1997 (20.8)

 

1207 (21.1)

1232 (21.6)

 

5

796 (11.2)

1018 (10.6)

 

603 (10.6)

594 (10.4)

 

Diabetes diagnosis (n, %)

1680 (23.7)

2055 (21.4)

0.05

1287 (22.5)

1303 (22.8)

0.01

MI in 5 years prior (n, %)

94 (1.3)

104 (1.1)

0.02

67 (1.2)

62 (1.1)

0.01

CVA in 5 years prior (n, %)

38 (0.5)

25 (0.3)

0.04

17 (0.3)

12 (0.2)

0.02

History of CHF (n, %)

302 (4.3)

365 (3.8)

0.02

230 (4.0)

214 (3.7)

0.01

History of COPD (n, %)

1072 (15.1)

1359 (14.2)

0.03

836 (14.6)

827 (14.5)

0.00

History of hypertension (n, %)

4287 (60.6)

5481 (57.2)

0.07

3372 (59.1)

3432 (60.1)

0.02

History of arrhythmia (n, %)

52 (0.7)

57 (0.6)

0.02

38 (0.7)

38 (0.7)

0.00

History of dementia (n, %)

105 (1.5)

171 (1.8)

0.02

70 (1.2)

76 (1.3)

0.01

History of liver disease (n, %)

23 (0.3)

38 (0.4)

0.01

20 (0.4)

21 (0.4)

0.00

History of renal disease (n, %)

175 (2.5)

248 (2.6)

0.01

137 (2.4)

130 (2.3)

0.01

  1. Note: in order to comply with ICES privacy regulations, cell sizes smaller than 5 were suppressed. Where cells <5 would be calculable, the next smallest cell in the category was also suppressed. Note: Socioeconomic status was assessed using a standardised technique based on the income quintile of the patient’s neighborhood of residence. Geographic region was characterised using local health integration networks (LHINs), regions that plan and deliver health-care resources and thus affect a patient’s access to care20
  2. GP general practitioner, RUB resource utilisation band, a measure of comorbidity derived from the Johns Hopkins ADG system, MI myocardial infarction, CVA cerebrovascular accident, CHF congestive heart failure, COPD chronic obstructive pulmonary disease