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. 2015 Feb 3;17(2):e33. doi: 10.2196/jmir.3938

Table 2.

Univariate polytomous logistic regression for baseline predictors of iDAT app use trajectory group membership (odds ratios are calculated with Minimal Users as the reference group).



Minimal Users (n=66) Intermittent-Waning Users
(n=10)
Consistent Users
(n=8)
Overall P value


n (%) or
mean (SD)
n (%) or
mean (SD)
OR (95% CI) P n (%) or
mean (SD)
OR (95% CI) P
Gender (female) 30 (45%) 4 (40%) 0.8 (0.2-3.1) .75 7 (88%) 8.4 (1.0-72.1) .052 .14
Age, years 47.8 (8.7) 47.2 (7.7) 1.0 (0.9-1.1) .82 52.0 (7.7) 1.1 (1.0-1.2) .20 .41
Body Mass Index (BMI) 29.1 (6.3) 31.0 (5.7) 1.0 (0.9-1.2) .38 26.3 (4.2) 0.9 (0.8-1.1) .20 .27
Glycosylated hemoglobin (HbA1c) 8.9 (2.5)a 7.2 (1.6) 0.7 (0.4-1.0) .07 8.5 (3.0)b 0.9 (0.7-1.3) .71 .19
iDATcusefulness score (0-9) 6.6 (1.6) 7.2 (1.1) 1.4 (0.8-2.3) .21 7.4 (1.2) 1.5 (0.9-2.7) .15 .20
Healthy diet score (0-9) 4.6 (1.9) 5.2 (1.5) 1.2 (0.8-1.7) .39 6.1 (2.1) 1.6 (1.0-2.5) .045 .11
Diet motivation score (0-9) 7.1 (1.6) 7.7 (0.9) 1.4 (0.8-2.3) .25 8.3 (1.0) 2.1 (1.0-4.5) .055 .10
Exercise frequency .32

Few times or none per year 29 (44%) 4 (40%) 0.6 (0.1-2.7) .49 1 (13%) 0.1 (0.1-1.1) .06

1-4 times per month 20 (30%) 2 (20%) 0.4 (0.1-2.6) .36 2 (25%) 0.3 (0.1-2.0) .23

More than once a week 17 (26%) 4 (40%) Ref
5 (62%) Ref

Exercise motivation score (0-9) 6.4 (1.5) 7.4 (1.3) 1.8 (1.0-3.1) .049 8.3 (0.9) 3.9 (1.6-9.6) .003 .004
DES-SFd(1-5) 4.0 (0.5) 4.4 (0.3) 6.6 (1.4-29.8) .02 4.3 (0.5) 4.0 (0.8-19.4) .09 .02

an=56, not all patients had HbA1clevels at baseline. bn=7, not all patients had HbA1clevels at baseline.

ciDAT: interactive Diet and Activity Tracker

dDES-SF: Diabetes Empowerment Scale-Short Form