Table 1.

Descriptive statistics for NCDB invasive epithelial ovarian cancer cohort based on era of diagnosis (1998–2002, 2003–2007) (N = 111,956).

Risk factor	All		Era of diagnosis 1998–2002		Era of diagnosis 2003–2007		p-Value
	N	%	N	%	N	%
Patient characteristics
Age (mean, SD)	62.29	14.03	62.32	14.14	62.27	13.92	0.6059
<60 years	48,215	43.07	23,518	42.47	24,697	43.65	<.0001
60–75 years	41,013	36.63	20,636	37.26	20,377	36.02
>75 years	22,728	20.30	11,226	20.27	11,502	20.33
Race							<.0001
White	99,265	88.66	49,491	89.37	49,774	87.98
African Americans	11,110	9.92	5214	9.41	5896	10.42
Unknown	1581	1.41	675	1.22	906	1.60
Median household income — 2000							<.0001
$46,000 +	43,341	38.71	21,145	38.18	22,196	39.23
$35,000–$45,999	29,997	26.79	14,965	27.02	15,032	26.57
<$35,000	32,163	28.73	16,337	29.50	15,826	27.97
Missing	6455	5.77	2933	5.30	3522	6.23
Primary payer at diagnosis							<.0001
Private insurance	18,059	16.13	10,738	19.39	7321	12.94
Medicare/medicare supplements	44,727	39.95	22,109	39.92	22,618	39.98
Managed care/TRICARE/military	35,813	31.99	15,718	28.38	20,095	35.52
Medicaid/federal insurance programs/public health service	4991	4.46	2213	4.00	2778	4.91
Not insured — self pay	4344	3.88	1984	3.58	2360	4.17
Missing: insurance status unknown	4022	3.59	2618	4.73	1404	2.48
Tumor characteristics
Tumor stage							<.0001
Stage I	19,516	17.43	9995	18.05	9521	16.83
Stage II	7941	7.09	4042	7.30	3899	6.89
Stage III	43,918	39.23	21,888	39.52	22,030	38.94
Stage IV	27,587	24.64	14,605	26.37	12,982	22.95
UNK	9756	8.71	3783	6.83	5973	10.56
NA	53	0.05	16	0.03	37	0.07
Improperly staged	3185	2.84	1051	1.90	2134	3.77
Hospital ovarian cancer volume/year							<.0001
1–7 cases/year	28,122	25.12	14,961	27.02	13,161	23.26
8–16 cases/year	27,946	24.96	13,764	24.85	14,182	25.07
17–28 cases/year	27,839	24.87	13,216	23.86	14,623	25.85
≥29 cases/year	28,049	25.05	13,439	24.27	14,610	25.82
Facility type							<.0001
Community cancer program	13,777	12.31	7209	13.02	6568	11.61
Comprehensive community cancer program	49,977	44.64	24,960	45.07	25,017	44.22
Academic/research program (includes NCI-designated comprehensive cancer centers)	48,202	43.05	23,211	41.91	24,991	44.17
Total	111,956	100.00	55,380	100.00	56,576	100.00