Table 1.

Demographic Characteristics of Cervical Cancer Cases and Matched Controls, US Pacific Northwest, 1980–2010

Characteristic	Cases (n = 39)		Controls (n = 80)
	No.	%a	No.	%a
Health plan enrollment
Group Healthb	16	41.0	34	42.5
Kaiser Permanente Northwestc	23	59.0	46	57.5
Age at diagnosisd, years
55–59	15	38.5	28	35.0
60–64	9	23.1	20	25.0
65–69	5	12.8	10	12.5
70–74	6	15.4	12	15.0
≥75	4	10.3	10	12.5
Age at death, years
55–59	8	20.5	NA
60–64	11	28.2	NA
65–69	7	17.9	NA
70–74	6	15.4	NA
≥75	7	17.9	NA
Enrollment length prior to diagnosis, years
<10	15	38.5	31	38.8
10–14	13	33.3	27	33.8
≥15	11	28.2	22	27.5
Smoking history
Never	12	30.8	33	41.3
Nonsmokere	7	17.9	14	17.5
Former smokerf	8	20.5	22	27.5
Current smoker	12	30.8	11	13.8
Body mass indexg
<18.5	1	3.2	1	1.3
18.5–24.9	11	35.5	29	38.7
25.0–29.9	5	16.1	24	32.0
30.0–34.9	4	12.9	10	13.3
≥35.0	10	32.3	11	14.7
Unknown	8		5
Race
White	36	94.7	74	97.4
Hispanic	1	2.6	0	0
Asian	1	2.6	2	2.6
Unknown	1		4
Marital status
Never married	0	0	2	2.5
Married	20	55.6	54	68.4
Divorced	5	13.9	12	15.2
Widowed	10	27.8	11	13.9
Separated	1	2.8	0	0
Unknown	3		1
Parity
0	2	5.1	9	11.3
1	2	5.1	8	10.0
2	7	17.9	23	28.8
3	11	28.2	12	15.0
4	10	25.6	13	16.3
≥5	17	17.9	15	18.8

Abbreviation: NA, not applicable.

^a Percentage excludes unknowns, if any.

^b Group Health is based in Seattle, Washington.

^c Kaiser Permanente Northwest is based in Portland, Oregon.

^d “At diagnosis” refers to the diagnosis date of the case or of the control's matched case (i.e., the reference date).

^e Documented as a current nonsmoker as of index date; past smoking habits unknown.

^f Documented as a current nonsmoker as of index date; documentation of smoking in the past.

^g Body mass index is calculated as weight (kg)/height (m)².