Table 1

Patient characteristics
Diabetes status at cancer diagnosis
Overall (N = 2,418) Previously diagnosed (n = 1,784) Previously undiagnosed (n = 634) P-value
N % (SD) n % (SD) n % (SD)
Age at cancer diagnosis (years)
66-70 326 13.5% 234 13.1% 92 14.5% 0.77
71-75 529 21.9% 397 22.3% 132 20.8%
76-80 594 24.6% 437 24.5% 157 24.8%
>80 969 40.1% 716 40.1% 253 39.9%
Mean & (SD) age 77.8 6.9 77.8 7.0 77.7 6.9
Race/ethnicity
White 2,156 89.2% 1,584 88.8% 572 90.2% 0.47
Black 132 5.5% 103 5.8% 29 4.6%
Hispanic 89 3.7% 64 3.6% 25 3.9%
Other 41 1.7% 33 1.8% 8 1.3%
Year of diagnosis
2001 464 19.2% 322 18.0% 142 22.4% 0.05
2002 482 19.9% 347 19.5% 135 21.3%
2003 466 19.3% 347 19.5% 119 18.8%
2004 468 19.4% 363 20.3% 105 16.6%
2005 538 22.2% 405 22.7% 133 21.0%
Stage at diagnosis
In situ 274 11.3% 217 12.2% 57 9.0% <0.0001
I 920 38.0% 705 39.5% 215 33.9%
II 786 32.5% 579 32.5% 207 32.6%
III 239 9.9% 175 9.8% 64 10.1%
IV 199 8.2% 108 6.1% 91 14.4%
Estrogen (ER) and progesterone (PR) receptor status
ER and PR positive 1,193 49.3% 881 49.4% 312 49.2%
ER or PR positive 327 13.5% 238 13.3% 89 14.0% 0.89
ER and PR negative 324 13.4% 244 13.7% 80 12.6%
Unknown/missing 574 23.7% 421 23.6% 153 24.1%
Histologic grade
1 447 18.5% 336 18.8% 111 17.5% 0.61
2 872 36.1% 652 36.5% 220 34.7%
3 696 28.8% 502 28.1% 194 30.6%
4 71 2.9% 49 2.7% 22 3.5%
Unknown/missing 332 13.7% 245 13.7% 87 13.7%
NCI Comorbidity Index
0 1,051 43.5% 627 35.1% 410 64.7% <0.0001
1 699 28.9% 560 31.4% 145 22.9%
≥ 2 668 27.6% 597 33.5% 79 12.5%
Indicators of poor performance
0 1,169 48.3% 692 38.8% 477 75.2% <0.0001
≥ 1 1,249 51.7% 1,092 61.2% 157 24.8%
Types of physician visits
Primary care and medical specialist 1,621 67.0% 1,277 71.6% 344 54.3% <0.0001
Primary care, no medical specialist 381 15.8% 254 14.2% 127 20.0%
Medical specialist, no primary care 226 9.3% 154 8.6% 72 11.4%
Other specialist only 57 2.4% 34 1.9% 23 3.6%
None 133 5.5% 65 3.6% 68 10.7%
Preventive services
0 236 9.8% 123 6.9% 113 17.8% <0.0001
1 403 16.7% 294 16.5% 109 17.2%
≥ 2 1,779 73.6% 1,367 76.6% 412 65.0%
Percent in census tract with some college
<25% 883 36.5% 656 36.8% 227 35.8% 0.66
≥25% 1,535 63.5% 1,128 63.2% 407 64.2%
Percent in census tract living in poverty
<5% 686 28.4% 509 28.5% 177 27.9% 0.29
5-7% 343 14.2% 255 14.3% 88 13.9%
8-12% 542 22.4% 383 21.5% 159 25.1%
>12% 847 35.0% 637 35.7% 210 33.1%
Type of geographic area
Large metropolitan 1,298 53.7% 952 53.4% 346 54.6% 0.74
Metropolitan 696 28.8% 510 28.6% 186 29.3%
Urban 165 6.8% 125 7.0% 40 6.3%
Less urban/rural 259 10.7% 197 11.0% 62 9.8%

SD: Standard deviation. The NCI Comorbidity Index is based on claims 24 – 4 months before cancer, and excludes two diabetes-related conditions.

Griffiths et al.

Griffiths et al. BMC Cancer 2012 12:613   doi:10.1186/1471-2407-12-613

Open Data