Table 3. Factors associated with delayed upfront surgery more than 30 days.
| Variables | No. of cases | No. of events | Proportion (%) | OR | 95% CI | p-value | ||
|---|---|---|---|---|---|---|---|---|
| Lower | Upper | |||||||
| Age at diagnosis (yr) | ||||||||
| < 40 | 11,223 | 1,066 | 9.5 | Reference | ||||
| 40–49 | 38,260 | 3,778 | 9.9 | 1.061 | 0.985 | 1.143 | 0.120 | |
| 50–59 | 33,574 | 3,253 | 9.7 | 1.040 | 0.963 | 1.123 | 0.320 | |
| ≥ 60 | 26,068 | 2,502 | 9.6 | 1.080 | 0.995 | 1.174 | 0.068 | |
| Insurance | 109,125 | |||||||
| Health insurance | 105,850 | 10,371 | 9.8 | Reference | ||||
| Medical aid | 3,275 | 228 | 7.0 | 1.067 | 0.923 | 1.229 | 0.373 | |
| CCI (continuous) | NA | NA | NA | 1.017 | 1.005 | 1.028 | 0.004 | |
| Regions | ||||||||
| Other-Other | 27,465 | 1,042 | 3.8 | Reference | ||||
| Seoul-Seoul | 43,535 | 4,971 | 11.4 | 2.815 | 2.625 | 3.022 | < 0.001 | |
| Metro-Metro | 25,876 | 1,459 | 5.6 | 1.468 | 1.352 | 1.594 | < 0.001 | |
| Metro-Seoul | 4,145 | 1,200 | 29.0 | 8.088 | 7.357 | 8.893 | < 0.001 | |
| Other-Seoul | 8,104 | 1,927 | 23.8 | 6.210 | 5.717 | 6.750 | < 0.001 | |
| Year of diagnosis | ||||||||
| 2010 | 10,749 | 591 | 5.5 | Reference | ||||
| 2011 | 12,064 | 772 | 6.4 | 1.223 | 1.094 | 1.369 | < 0.001 | |
| 2012 | 12,474 | 652 | 5.2 | 0.909 | 0.809 | 1.021 | 0.108 | |
| 2013 | 13,241 | 900 | 6.8 | 1.185 | 1.063 | 1.323 | 0.002 | |
| 2014 | 13,918 | 1,191 | 8.6 | 1.506 | 1.357 | 1.673 | < 0.001 | |
| 2015 | 14,357 | 1,579 | 11.0 | 2.110 | 1.909 | 2.335 | < 0.001 | |
| 2016 | 16,013 | 2,190 | 13.7 | 2.721 | 2.471 | 3.000 | < 0.001 | |
| 2017 | 16,309 | 2,724 | 16.7 | 3.473 | 3.160 | 3.822 | < 0.001 | |
| Hospital | ||||||||
| Others | 32,313 | 1,160 | 3.6 | Reference | ||||
| Tertiary hospital | 76,812 | 9,439 | 12.3 | 2.446 | 2.292 | 2.613 | < 0.001 | |
OR = odds ratio; CI = confidence interval; CCI = Charlson comorbidity index; NA = not available.