Demographic and clinical characteristics associated with time between colonoscopy and colorectal cancer surgery, separately for colon and rectal cancer cases
| Colon cancer (n=265) | Rectal cancer (n=142) | |||
| Adjusted HR* (95% CI) | Overall p value† | Adjusted HR* (95% CI) | Overall p value† | |
| Place of residence at diagnosis | 0.77 | 0.01 | ||
| Metropolitan | 1.00 (ref) | 1.00 (ref) | ||
| Other urban | 1.19 (0.67 to 2.10) | 1.55 (0.72 to 3.37) | ||
| Rural | 1.21 (0.71 to 2.07) | 0.47 (0.21 to 1.09) | ||
| Type of housing | 0.49 | 0.002 | ||
| House | 1.00 (ref) | 1.00 (ref) | ||
| Flat/unit | 1.18 (0.74 to 1.87) | 0.31 (0.12 to 0.82) | ||
| House on farm | 1.65 (0.84 to 3.25) | 0.43 (0.18 to 1.03) | ||
| Elderly accommodation | 1.07 (0.55 to 2.11) | 0.19 (0.06 to 0.61) | ||
| Other/unspecified | Not incl. | Not incl. | ||
| Income level | 0.04 | 0.06 | ||
| <$20K p.a. | 1.00 (ref) | 1.00 (ref) | ||
| $20K–<$40K p.a. | 0.77 (0.46 to 1.29) | 0.59 (0.30 to 1.17) | ||
| $40K–<$70K p.a. | 0.93 (0.55 to 1.57) | 0.43 (0.18 to 0.99) | ||
| $70K+ p.a. | 1.85 (1.01 to 3.40) | 0.54 (0.20 to 1.43) | ||
| Unspecified | 0.98 (0.63 to 1.52) | 1.24 (0.62 to 2.46) | ||
| Health insurance | 0.12 | 0.02 | ||
| Private with extras | 1.00 (ref) | 1.00 (ref) | ||
| Private no extras | 0.80 (0.52 to 1.22) | 1.79 (0.93 to 3.45) | ||
| DVA/healthcare card | 0.67 (0.46 to 0.98) | 3.33 (1.59 to 6.97) | ||
| None of these | 0.53 (0.29 to 0.97) | 1.29 (0.58 to 2.90) | ||
| Missing | 0.42 (0.12 to 1.42) | 0.99 (0.28 to 3.46) | ||
| Self-reported health status | 0.10 | 0.004 | ||
| Good to excellent | 1.00 (ref) | 1.00 (ref) | ||
| Fair/poor | 0.64 (0.42 to 0.96) | 0.44 (0.21 to 0.92) | ||
| Unspecified | 0.95 (0.48 to 1.89) | 0.23 (0.07 to 0.76) | ||
| Chronic obstructive pulmonary disease | 0.26 | 0.004 | ||
| Yes | 1.39 (0.79 to 2.44) | 6.39 (1.80 to 22.70) | ||
| No | 1.00 (ref) | 1.00 (ref) | ||
| Other key comorbidity | 0.04 | 0.06 | ||
| Yes | 1.64 (1.03 to 2.59) | 2.14 (0.97 to 4.75) | ||
| No | 1.00 (ref) | 1.00 (ref) | ||
| Disease stage | 0.05 | 0.87 | ||
| Localised | 1.00 (ref) | 1.00 (ref) | ||
| Regional | 1.08 (0.79 to 1.47) | 1.03 (0.64 to 1.66) | ||
| Distant metastases | 0.53 (0.28 to 1.02) | 1.39 (0.47 to 4.14) | ||
| Unknown | 0.48 (0.24 to 0.97) | 0.65 (0.17 to 2.50) | ||
The variables not shown in the table were not associated with time to surgery for colon or rectal cancers. HR <1 indicates longer time between colonoscopy and surgery.
↵* Adjusted for all other variables in this table, as well as for sex, age, country of birth, language spoken at home, socioeconomic status, education level, marital status, body mass index, smoking status, cardiovascular disease, diabetes, family history of colorectal cancer, year of diagnosis and diagnosis before/after completing study questionnaire.
↵† Overall p value from proportional hazards regression (ref): reference category.
DVA, Department of Veterans Affairs; Not incl., this category was not included in proportional hazards regression.