Table 2.

Response mode and language by experimental condition and Spanish‐preferring predicted probabilities, 2010 fee‐for‐service beneficiaries with prescription drug coverage (n = 177 139)

	Received bilingual mailing						Did not receive bilingual mailing
	Predicted probability of Spanish preference						Predicted probability of Spanish preference						P‐value (Received vs Did Not Receive)b
	>40% (n = 1470)		25‐40% (n = 2318)		10‐25% (n = 1212)		>40% (n = 1469)		25‐40% (n = 2319)		10‐25% (n = 1212)		>40%	25‐40%	10‐25%
	N	%	N	%	N	%	N	%	N	%	N	%
Resolution of cases
Spanish mail	265	18.0	363	15.7	135	11.1	0	0.0	0	0.0	0	0.0	<0.0001	<0.0001	<0.0001
English mail	120	8.2	319	13.8	235	19.4	296	20.1	561	24.2	337	27.8	<0.0001	<0.0001	<0.0001
Spanish phone	162	11.0	191	8.2	83	6.8	174	11.8	214	9.2	67	5.5	0.49	0.25	0.21
English phone	14	1.0	50	2.2	64	5.3	12	0.8	72	3.1	59	4.9	0.84	0.05	0.71
Nonresponse/Incompletea	909	61.8	1395	60.2	695	57.3	987	67.2	1472	63.5	749	61.8	0.003	0.02	0.03
Response ratesa
Overall		38.2		39.8		42.7		32.8		36.5		38.2	0.003	0.02	0.03
Total mail		26.2		29.4		30.5		20.1		24.2		27.8	0.0001	<0.0001	0.15
Total phone		12.0		10.4		12.1		12.7		12.3		10.4	0.58	0.04	0.20
Phone among mail nonrespondents		16.2		14.7		17.5		15.9		16.3		14.4	0.82	0.22	0.09
Percentage of responses in Spanish
All responses		76.1		60.0		42.2		36.1		25.3		14.5	<0.0001	<0.0001	<0.0001
Mail responses		68.8		53.2		36.5		0.0		0.0		0.0	<0.0001	<0.0001	<0.0001
Phone responses		92.0		79.3		56.5		93.5		74.8		53.2	0.68	0.25	0.63

Note: P‐values < 0.05 are bolded.

^aA small number of ineligibles were pooled with nonrespondents to produce conservative response rates, since it is possible that the detection of ineligibles would differ by language and mode.

^bFisher's exact test P‐value comparing the two experimental groups within each predicted probability stratum.