Multiplicative disadvantage of being an unmarried and inadequately insured woman living in poverty with colon cancer: historical cohort exploration in California

Table 3 Effect of the interaction of marital status, health insurance and neighborhood poverty on chemotherapy receipt among women with stage II to IV colon cancer

	No.^*	Rate (%)	RR^†	(95% CI)	Married-unmarried chemotherapy RD
<30% Poor & adequately insured
Married	405	39.7	1.00	. . .
Unmarried	344	39.0	0.98	(0.82, 1.17)	0.7%
Intermediate groups ^‡
Married	408	38.3	1.00	. . .
Unmarried	628	34.6	0.90	(0.76, 1.07)	3.7%
≥30% Poor & inadequately insured
Married	155	37.1	1.00	. . .
Unmarried	379	27.3	0.74	(0.58, 0.95)	9.8%

Notes. RR = standardized rate ratio, RD = standardized rate difference, CI = confidence interval. All rates were directly age and stage-adjusted using this study’s population of women as the standard and reported as percentages (rates per 100).
^*Number of incident colon cancer cases.
^†A rate ratio of 1.00 was the baseline.
^‡Women living in high poverty neighborhoods, but adequately insured or women living in less poor neighborhoods, but inadequately insured. These two groups did not differ significantly on their married-unmarried chemotherapy RDs.

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