Table 3.

Characteristics of Young Women Having Landline Telephones Compared With Those Having Only Cellular Telephones, Seattle-Puget Sound Region, Washington State, 2008–2009 (Cell Phone Participants) and 2005–2007 (Landline Participants)

Characteristic	Landline (n = 526)		Cellular Only (n = 247)		ORa	95% CI
	No.	%	No.	%b
Age, years
20–24	3	0.6	77	31.2
25–29	8	1.5	61	24.7
30–34	50	9.5	48	19.4
35–39	155	29.5	32	13.0
40–44	310	58.9	29	11.7
Nonwhite	76	14.7	59	22.8	1.39	0.80, 2.41
Hispanic originc	24	4.6	19	12.8	1.57	0.65, 3.78
Current smoker	67	12.8	40	12.9	1.14	0.63, 2.06
Ever used oral contraceptivesc	480	91.3	196	91.6	1.10	0.56, 2.18
Ever used birth control shots	67	12.7	49	17.4	1.19	0.68, 2.06
Obese (body mass index ≥30)	101	19.2	35	18.3	0.93	0.54, 1.61
College degreec	305	58.2	148	67.3	1.92	1.19, 3.11
Ever had a live- or stillbirthd	480	93.2	47	55.0	0.07	0.04, 0.12
Ever had a mammograme	246	79.6	22	75.9	0.80	0.33, 1.97
First-degree family history of breast cancer	47	8.9	14	13.0	1.28	0.60, 2.72
Among women aged ≥35 years	43	9.3	7	13.3	1.43	0.61, 3.39
Second-degree family history of breast cancer	132	25.1	61	21.4	0.98	0.61, 1.58
Among women aged ≥35 years	117	25.2	12	20.3	0.74	0.38, 1.45
Marital status
Married	407	77.7	73	39.2	1.0	Referent
Single	83	15.8	142	54.5	7.20	4.41, 11.75
Living with partner	34	6.5	31	6.3	1.82	0.82, 4.01
Household income, US dollarsf
<25,000	40	7.6	49	9.9	1.0	Referent
25,000–<50,000	66	12.6	73	26.5	1.67	0.75, 3.71
≥50,000	417	79.7	109	63.6	1.16	0.53, 2.53

Abbreviations: CI, confidence interval; OR, odds ratio.

^aOdds ratio comparing women having cell phones only with women having landline telephones, adjusted for age (20–29, 30–34, 35–39, 40–44 years).

^bAdjusted to age distribution of landline group by using direct standardization.

^cOdds ratios also adjusted for marital status (married, single, living with partner).

^dAmong women aged 30–44 years.

^eAmong women aged 40–44 years.

^fOdds ratios also adjusted for marital status (married, single, living with partner) and education (no college degree, college degree).