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Table 3 Characteristics of the study population in Ontario, stratified by immigrant status and region of origin

From: Disparities in breast cancer diagnosis for immigrant women in Ontario and BC: results from the CanIMPACT study

Variable Value Long-term residents Immigrants East Asia & Pacific Eastern Europe & Central Asia Latin American & Caribbean Middle East & North Africa South Asia Sub-Saharan Africa USA/New Zealand/Australia Western Europe
N (%)   41,456 (88.3) 5495 (11.7) 1636 (3.5) 933 (2.0) 752 (1.6) 513 (1.1) 968 (2.1) 261 (0.6) 121 (0.3) 311 (0.7)
Primary care access variables
 Baseline UPC index score 0 visits 3022 (7.3) 565 (10.3) 136 (8.3) 103 (11.0) 62 (8.2) 91 (17.7) 91 (9.4) 25 (9.6) 19 (15.7) 38 (12.2)
1–2 visits 4496 (10.8) 509 (9.3) 156 (9.5) 115 (12.3) 65 (8.6) 33 (6.4) 62 (6.4) 17 (6.5) 18 (14.9) 43 (13.8)
UPC < =.75(low) 10,703 (25.8) 1796 (32.7) 507 (31.0) 289 (31.0) 270 (35.9) 160 (31.2) 333 (34.4) 109 (41.8) 38 (31.4) 90 (28.9)
UPC > 0.75(high) 23,235 (56.0) 2625 (47.8) 837 (51.2) 426 (45.7) 355 (47.2) 229 (44.6) 482 (49.8) 110 (42.1) 46 (38.0) 140 (45.0)
 Primary care visits in 6 mths prior to diagnosis Mean ± SD 3.4 ± 3.3 4.0 ± 3.2 4.0 ± 3.0 3.5 ± 3.1 4.2 ± 3.2 4.2 ± 3.5 4.5 ± 3.4 3.9 ± 3.5 3.1 ± 3.7 3.2 ± 3.0
Median (IQR) 3 (1–4) 3 (2–5) 3 (2–5) 3 (2–5) 3 (2–5) 3 (2–6) 4 (2–6) 3 (2–5) 2 (1–4) 3 (1–4)
Control variables
 Age at diagnosis Mean ± SD 61.9 ± 13.6 53.2 ± 12.6 51.8 ± 11.2 54.3 ± 13.1 53.1 ± 13.0 53.4 ± 12.2 54.6 ± 13.1 52.7 ± 13.0 52.1 ± 11.2 53.7 ± 13.3
 Co-morbidities (ADGs) 0 -- 5 20,321 (49.0) 2760 (50.2) 823 (50.3) 495 (53.1) 340 (45.2) 252 (49.1) 471 (48.7) 132 (50.6) 69 (57.0) 111 (35.7)
6 -- 9 14,942 (36.0) 1994 (36.3) 617 (37.7) 320 (34.3) 309 (41.1) 175 (34.1) 355 (36.7) 95 (36.4) 37 (30.6) 86 (27.7)
10 + 6193 (14.9) 741 (13.5) 196 (12.0) 118 (12.6) 103 (13.7) 86 (16.8) 142 (14.7) 34 (13.0) 15 (12.4) 47 (15.1)
 Income quintile 1 (lowest) 6720 (16.2) 1411 (25.7) 414 (25.3) 210 (22.5) 232 (30.9) 124 (24.2) 264 (27.3) 91 (34.9) 17 (14.0) 59 (19.0)
2 7917 (19.1) 1173 (21.3) 387 (23.7) 167 (17.9) 206 (27.4) 81 (15.8) 214 (22.1) 39 (14.9) 15 (12.4) 64 (20.6)
3 8006 (19.3) 1099 (20.0) 330 (20.2) 160 (17.1) 147 (19.5) 102 (19.9) 239 (24.7) 55 (21.1) 20 (16.5) 46 (14.8)
4 9017 (21.8) 1032 (18.8) 287 (17.5) 218 (23.4) 100 (13.3) 112 (21.8) 175 (18.1) 42 (16.1) 27 (22.3) 71 (22.8)
5 9646 (23.3) 776–780 211–215 176–180 67 (8.9) 94 (18.3) 76 (7.9) 34 (13.0) 42 (34.7) 71 (22.8)
Missing 150 (0.4) <=5 <=5 <=5 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)
Outcome variables
 Stage at diagnosis I 15,732 (37.9) 1736 (31.6) 586 (35.8) 294 (31.5) 197 (26.2) 164 (32.0) 250 (25.8) 84 (32.2) 52 (43.0) 109 (35.0)
II 14,624 (35.3) 1983 (36.1) 602 (36.8) 338 (36.2) 288 (38.3) 197 (38.4) 321 (33.2) 95 (36.4) 35 (28.9) 107 (34.4)
III 5271 (12.7) 837 (15.2) 196 (12.0) 176 (18.9) 131 (17.4) 73 (14.2) 161 (16.6) 38 (14.6) 18 (14.9) 44 (14.1)
IV 1849 (4.5) 210 (3.8) 43 (2.6) 38 (4.1) 43 (5.7) 13 (2.5) 42 (4.3) 13 (5.0) 6 (5.0) 12 (3.9)
Unknown 3980 (9.6) 729 (13.3) 209 (12.8) 87 (9.3) 93 (12.4) 66 (12.9) 194 (20.0) 31 (11.9) 10 (8.3) 39 (12.5)
 Screen detected n (%) screen-detected 11,876 (28.6) 1081 (19.7) 295 (18.0) 191 (20.5) 131 (17.4) 121 (23.6) 194 (20.0) 52 (19.9) 28 (23.1) 69 (22.2)
 Diagnostic Interval (Screened patients) Median (IQR) 28 (15–47) 33 (19–55) 38 (23–60) 31 (17–49) 33 (21–58) 30 (20–57) 33 (19–50) 33 (21–49) 22 (9–35) 28 (13–48)
90th percentile 73 86 91 76 99 107 84 74 76 107
 Diagnostic Interval (Symptomatic patients) Median (IQR) 33 (15–66) 38 (19–76) 44 (22–82) 35 (16–73) 41 (21–78) 32 (15–73) 35 (17–64) 40 (19–77) 32 (16–68) 36 (15–77)
90th percentile 126 130 136 127 140 120 118 112 142 133
  1. P-value <.001 for all variables for comparison of immigrants versus long-term residents