Table 3.

Item Statistics

Phase 1a			Phase 2b
Item	Mean (SD)	Alternatives (n, % Endorsing)d	Item-Total Correlation (Corrected)	Mean (SD)	Alternatives (n, % Endorsing)d	Item-Total Correlation (Corrected)	Item-Criterion (Number of MRPs) Correlation
1. Sometimes my medication has effects I do not like.e	2.99 (1.31)	1(65, 17.0) 2(94, 24.5) 3(41, 10.7) 4(144, 37.6) 5(39, 10.2)	0.50c	2.69 (1.33)	1(48, 24.1) 2(55, 27.6) 3(23, 11.6) 4(57, 28.6) 5(16, 8.0)	0.51c	0.12
2. My medication does not seem to help that much.e	1.89 (0.98)	1(160, 40.8) 2(158, 40.3) 3(41, 10.5) 4(24, 6.1) 5(9, 2.3)	0.43c	2.12 (1.05)	1(64, 32.2) 2(78, 39.2) 3(31, 15.6) 4(22, 11.1) 5(4, 2.0)	0.50c	0.02
3. Sometimes I think I take too many medications.e	2.63 (1.31)	1(92, 23.6) 2(123, 31.5) 3(49, 12.6) 4(91, 23.3) 5(35, 9.0)	0.48c	2.89 (1.31)	1(36, 18.1) 2(52, 26.1) 3(30, 15.1) 4(59, 29.6) 5(22, 11.1)	0.50c	0.26c
4. I worry about drug interactions between the medications I take.e	2.84 (1.25)	1(58, 15.1) 2(126, 32.9) 3(52, 13.6) 4(112, 29.2) 5(35, 9.1)	0.46c	2.73 (1.35)	1(46, 23.1) 2(56, 28.1) 3(23, 11.6) 4(53, 26.6) 5(21, 10.6)	0.54c	0.23c
5. I have trouble taking my medication the way I am supposed to.e	2.11 (1.05)	1(113, 29.0) 2(194, 49.9) 319 (4.9) 4(54,13.9) 5(9, 2.3)	0.43c	1.93 (1.02)	1(76, 38.2) 2(89, 44.7) 3(9, 4.5) 4(21, 10.6) 5(4, 2.0)	0.45c	0.13
6. Sometimes I feel worse after I take my medication.e	2.22 (1.11)	1(106, 27.0) 2(182, 46.4) 3(30, 7.7) 4(60, 15.3) 5(14, 3.6)	0.58c	1.98 (0.98)	1(70, 35.2) 2(89, 44.7) 3(15, 7.5) 4(24, 12.1) 5(1, 0.5)	0.67c	0.09
7. Sometimes I think I may not be taking the right medication for my condition.e	2.35 (1.07)	1(77, 19.9) 2(181, 46.9) 3(62, 16.1) 4(49, 12.7) 5(17, 4.4)	0.50c	2.17 (1.04)	1(60, 30.2) 2(76, 38.2) 3(37, 18.6) 4(22, 11.1) 5(4, 2.0)	0.67c	0.17c
8. My medication interferes with my routine daily activities.e	2.03 (1.06)	1(138, 35.6) 2(165, 42.5) 3(31, 8.0) 4(44, 11.3) 5(10, 2.6)	0.61c	1.93 (0.92)	1(68, 34.2) 2(98, 49.2) 3(14, 7.0) 4(17, 8.5) 5(2, 1.0)	0.65c	0.08
9. My medication is helping improve my condition.	2.02 (0.79)	1(89, 23.1) 2(222, 57.5) 3(57, 14.8) 4(13, 3.4) 5(5, 1.3)	0.36c	2.11 (0.90)	1(49, 24.6) 2(98, 49.2) 3(38, 19.1) 4(10, 5.0) 5(4, 2.0)	0.32c	0.19c
Total Score on DTC, median (range)f	21 (9-41)			20 (9-40)

^aCronbach's alpha: 0.79

^bCronbach's alpha: 0.82

^cp < 0.05

^dMeasured on scale where 1=Strongly Agree, 2=Agree, 3=Not Sure, 4=Disagree, 5=Strongly Disagree

^eReverse-scored so that higher scores are associated with more MRPs

^fPossible scores range from 9 to 45