Table 2.

SMP-T2D measurement model

Concept (Questionnaire Item No.)	Study 1				Study 2
	Baseline Mean (SD)	% Min Score,% Max Score	Test-Retest Reliability†	Test-Retest Shift‡	Baseline Mean (SD)	% Min Score,% Max Score	During-Study Change‡
Patient behavior domains:
Monitor blood glucose (#3)	81.24 (24.68)	2.0, 49.7	0.86	0.25*	72.19 (34.12)	11.8, 44.1	0.11
Take medications as prescribed (#2)	96.70 (8.86)	0.0, 84.4	0.41	0.00	90.01 (21.25)	2.2, 71.0	-.09
Eat healthy (#4, #5)	65.16 (24.00)	3.4, 3.4	0.91	0.02	64.21 (25.35)	2.2, 5.4	0.35***
Engage in physical activity (#6, #7, #8)	69.16 (30.24)	4.8, 40.1	0.63	0.05	63.44 (30.72)	5.4, 32.3	−0.02
Cope with frustration and worry (#10, #11)	76.66 (22.07)	1.4, 25.2	0.80	0.15	72.04 (21.52)	0.0, 15.1	0.59***
Ease of patient behaviors:
Monitoring blood glucose (#9a)	84.93 (26.01)	4.1, 66.4	0.81	0.04	87.50 (26.34)	5.4, 75.0	0.02
Taking medications as prescribed (#9b)	92.81 (19.69)	2.7, 82.9	0.78	0.17	95.16 (17.00)	2.2, 89.2	0.05
Eating healthy (#9d, #9e, #9f)	72.76 (23.11)	1.4, 18.4	0.86	0.06	71.42 (23.45)	1.1, 16.1	0.20*
Engaging in physical activity (#9 g)	69.22 (30.28)	5.4, 36.7	0.87	0.06	72.04 (28.52)	4.3, 37.6	0.24*
Coping with frustration and worry (#9 h)	78.57 (27.13)	4.8, 48.3	0.79	0.03	80.11 (24.61)	2.2, 50.5	0.16
Ease of managing weight (#9c)	64.12 (31.52)	8.2, 29.3	0.88	0.04	68.82 (34.11)	8.6, 43.0	0.35***
Confidence in ability to manage diabetes (#12)	66.44 (26.00)	4.1, 22.6	0.88	0.09	62.90 (25.17)	2.2, 16.1	0.47***

† Test-retest reliability measured by Spearman-Brown coefficient, 1-week reproducibility.

‡ Change in mean from baseline represented in baseline standard deviation units: * p <; 0.05 (two-tailed); ** p <; 0.01 (two-tailed); *** p <; 0.001 (two-tailed).