Table 1.
Characteristics of the study population overall and by Aboriginal status, NSW Cancer Registry 2000–2008
| All (n = 301,356)a | Aboriginal (n = 2517) | Non-Aboriginal (n = 260,075) | ||||
|---|---|---|---|---|---|---|
| n (%) | n (CC %) | (MI %)b | n (CC %) | (MI %)b | P valuec | |
| Males | 168,326 (55.9) | 1313 (52.2) | (52.0) | 144,109 (55.4) | (55.9) | Χ2 (1) p = 0.001 |
| Age at diagnosis | Χ2 (8) p < 0.001; MW(z) = 24.3, p < 0.001 | |||||
| 0–39 | 17,031 (5.7) | 263 (10.5) | (11.0) | 13,398 (5.2) | (5.6) | |
| 40–49 | 24,538 (8.1) | 360 (14.3) | (14.9) | 19,810 (7.6) | (8.1) | |
| 50–59 | 50,578 (16.8) | 570 (22.7) | (22.7) | 42,361 (16.3) | (16.7) | |
| 60–64 | 34,754 (11.5) | 358 (14.2) | (14.1) | 29,730 (11.4) | (11.5) | |
| 65–69 | 38,813 (12.9) | 288 (11.4) | (11.3) | 33,548 (12.9) | (12.9) | |
| 70–74 | 40,688 (13.5) | 290 (11.5) | (11.4) | 35,587 (13.7) | (13.5) | |
| 75–79 | 40,276 (13.4) | 210 (8.3) | (7.9) | 35,701 (13.7) | (13.4) | |
| 80–84 | 30,592 (10.2) | 103 (4.1) | (4.0) | 27,658 (10.6) | (10.2) | |
| 85+ | 24,086 (8.0) | 75 (3.0) | (2.9) | 22,282 (8.6) | (8.0) | |
| Residential remoteness | Χ2 (3) p < 0.001; MW(z) = −30.3, p < 0.001 | |||||
| Major cities | 204,781 (68.0) | 1099 (43.7) | (43.5) | 178,436 (68.6) | (68.2) | |
| Inner regional | 71,652 (23.8) | 789 (31.4) | (31.2) | 60,863 (23.4) | (23.7) | |
| Outer regional | 23,235 (7.7) | 493 (19.6) | (19.7) | 19,467 (7.5) | (7.6) | |
| Remote/ Very remote | 1688 (0.6) | 136 (5.4) | (5.7) | 1309 (0.5) | (0.5) | |
| SEIFA quintile | Χ2
(4)
p < 0.001; MW(z) = −23.2, p < 0.001 |
|||||
| 1 (least disadvantaged) | 62,971 (20.9) | 192 (7.6) | (8.1) | 54,552 (21.0) | (21.0) | |
| 2 | 54,345 (18.0) | 324 (12.9) | (13.0) | 47,108 (18.1) | (18.1) | |
| 3 | 61,341 (20.4) | 484 (19.2) | (19.4) | 52,517 (20.2) | (20.4) | |
| 4 | 68,943 (22.9) | 724 (28.8) | (28.3) | 59,245 (22.8) | (22.8) | |
| 5 (most disadvantaged) | 53,756 (17.8) | 793 (31.5) | (31.3) | 46,653 (17.9) | (17.7) | |
| Stage at diagnosis | Χ2 (3) p < 0.001; MW(z) = −9.0, p < 0.001d | |||||
| Localised | 124,907 (41.5) | 834 (33.1) | (34.7) | 102,624 (39.5) | (41.5) | |
| Regional | 55,210 (18.3) | 578 (23.0) | (21.7) | 51,572 (19.8) | (18.3) | |
| Distant | 43,660 (14.5) | 552 (21.9) | (19.8) | 42,367 (16.3) | (14.4) | |
| Unknown | 77,579 (25.7) | 553 (22.0) | (23.8) | 63,512 (24.4) | (25.8) | |
| Vital statuse | Χ2 (2) p < 0.001 | |||||
| Alive | 182,801 (60.7) | 1172 (46.6) | (51.9) | 144,476 (55.6) | (60.7) | |
| Died due to the cancer | 89,465 (29.7) | 1108 (44.0) | (39.6) | 87,354 (33.6) | (29.6) | |
| Died due to other cause | 29,090 (9.7) | 237 (9.4) | (8.5) | 28,245 (10.9) | (9.7) | |
| Cancer site | Χ2 (13) p < 0.001 | |||||
| Stomach | 5794 (1.9) | 73 (2.9) | (2.7) | 5544 (2.1) | (1.9) | |
| Colorectalf | 40,288 (13.4) | 289 (11.5) | (11.0) | 37,334 (14.4) | (13.4) | |
| Colon | 25,794 | 176 (7.0) | 23,832 (9.2) | |||
| Rectum | 14,494 | 113 (4.5) | 13,502 (5.2) | |||
| Liver | 3433 (1.1) | 50 (2.0) | (1.8) | 3307 (1.3) | (1.1) | |
| Pancreas | 6729 (2.2) | 66 (2.6) | (2.3) | 6539 (2.5) | (2.2) | |
| Lung | 27,302 (9.1) | 392 (15.6) | (14.2) | 26,161 (10.1) | (9.0) | |
| Melanoma | 30,166 (10.0) | 70 (2.8) | (4.6) | 16,966 (6.5) | (10.1) | |
| Breastg | 37,266 (12.4) | 331 (13.2) | (13.3) | 32,754 (12.6) | (12.4) | |
| Cervix | 2222 (0.7) | 63 (2.5) | (2.6) | 1908 (0.7) | (0.7) | |
| Uterus | 5057 (1.7) | 47 (1.9) | (1.8) | 4620 (1.8) | (1.7) | |
| Prostate | 48,071 (16.0) | 226 (9.0) | (9.9) | 38,712 (14.9) | (16.1) | |
| Kidney | 8333 (2.8) | 91 (3.6) | (3.6) | 7478 (2.9) | (2.8) | |
| Bladder | 6912 (2.3) | 43 (1.7) | (1.6) | 6527 (2.5) | (2.3) | |
| Ill-defined & unspecified & other rare | 11,207 (3.7) | 110 (4.4) | (4.1) | 10,507 (4.0) | (3.7) | |
| Othersh | 68,576 (22.8) | 666 (26.5) | (26.3) | 61,718 (23.7) | (22.7) |
CC complete-case, MI multiple imputation, MW Mann-Whitney test, SEIFA socio-economic index for areas (Index of relative socio-economic disadvantage was used in this study).
aIncludes also cases with unknown Aboriginal status.
bPercentage after imputing Aboriginal status.
cΧ2 (df) = Pearson Chi square test (degrees of freedom) was used to test categorical differences and MW(z) = Mann-Whitney test (z value) to test for ordinal differences between Aboriginal and non-Aboriginal people using complete-case data.
dUnknown category was excluded when Mann-Whitney test was conducted.
eVital status at end of follow-up.
fColorectal cancers grouped together and separately for colon (ICD-O-3 C18) and rectum cancers (ICD-O-3 C19-C21).
g Includes 303 cases of male breast cancer.
hAll other cancer sites categorised to this group.