Table 2.
Mediation of self-care behaviors between diabetes knowledge and glycemic control in low-income patients with type 2 diabetes mellitus from Mexico City (n=513).
| Diabetes knowledge | X → Y (c path)a,h | ||||||||||||
| β | 95% CI | ||||||||||||
| Crude analysis | -0.10 | (-0.19, -0.01) | |||||||||||
| X → Y (c' path) directb,h | X → M (a path)c,h | M → Y (b path)d,h | Indirect effect (a*b)e,g | Proportion mediatedf | |||||||||
| β | 95% CI | β | 95% CI | β | 95% CI | β | 95% CI | β | 95% CI | ||||
| Self-care behavior | |||||||||||||
| Diet | (-0.30, 0.87) | ||||||||||||
| Specific | -0.11 | (-0.02, -0.19) | 0.13 | (0.06, 0.21) | 0.06 | (-0.04, 0.17) | 0.01 | (0.00, 0.03) | -0.11 | (-0.64, 0.04) | |||
| Global | -0.09 | (-0.17, 0.02) | 0.18 | (0.09, 0.26) | -0.09 | (-0.10, 0.00) | -0.01 | (-0.03, 0.00) | 0.13 | (-0.05, 0.75) | |||
| Total | -0.10 | (-0.12, 0.11) | 0.15 | (0.09, 0.22) | -0.03 | (-0.15, 0.08) | 0.00 | (-0.02, 0.02) | 0.01 | (-0.27, 0.34) | |||
| Physical activity, days a week | -0.08 | (-0.18, 0.01) | 0.18 | (0.09, 0.27) | -0.11 | (-0.19, -0.03) | -0.02 | (-0.04, 0.00) | 0.17 | (0.01, 0.85) | |||
| Blood sugar testing, days a week | -0.10 | (-0.06, 0.12) | 0.13 | (0.04, 0.22) | 0.02 | (-0.07, 0.10) | 0.00 | (-0.01, 0.02) | -0.04 | (-0.43, 0.19) | |||
| Foot care, days a week | -0.09 | (-0.07, 0.06) | 0.40 | (0.28, 0.53) | -0.02 | (-0.08, 0.04) | 0.00 | (-0.03, 0.02) | 0.02 | (-0.60, 0.49) | |||
| Self-care global score, days a week | -0.09 | (-0.19, 0.07) | 0.23 | (0.17, 0.28) | -0.10 | (-0.22, 0.03) | -0.01 | (-0.05, 0.02) | 0.13 | (-0.30, 0.87) | |||
a c path (total effect): The crude association between diabetes knowledge and glycemic control.
b c' path (direct effect): the association between diabetes knowledge and glycemic control, adjusted for mediator (self-care behavior)
c a path: association between diabetes knowledge and self-care behavior
d b path: association between self-care behavior and glycemic control
e Indirect effect (a*b): the indirect effect of the diabetes knowledge on glycemic control through self-care behavior
f Proportion effect mediated ((a*b)/c): the proportion of the total effect mediated through self-care behavior
g Confidence interval for indirect effects were calculated with bootstrapping (5000 samples)
h All analyses used linear regression models adjusted for age, sex, years since diagnosis, and SES