The I-SIGHT intervention consists of twelve interactive voice recognition (IVR) phone calls over a nine-month period and accompanying printed materials that are mailed to participants following each call. The phone call messages and print materials are tailored to individuals' circumstances using data from the screening and baseline interviews. The intervention is based on theoretical constructs from Social Cognitive Theory and the Health Belief Model, and emphasizes self-efficacy, medication taking skills, outcome expectancies, facilitators and barriers to compliance, and social support. The treatment group receives the tailored telephone intervention and mailed, printed materials.

The control group received usual care at each clinical site and interacted with study personnel only for data collection.

Thiss intervention consisted of tailored phone calls and follow-up mailings.

The adherence measure, developed and pilot tested by the I-SIGHT study team, assessed compliance adherence with medication taking, refills, and appointment-keeping by self-report and chart review. Subjects were considered nonadherent with medication-taking if they reported missing doses of any glaucoma medication within one month of the interview. Levels of medication-taking nonadherence were also examined by missed doses within 7 days, 2 weeks, or 1 mo of the interview. Nonadherence with refills was defined as running out of any glaucoma medication and missing a dose within a specified time frame (i.e. 1 year prior to the baseline interview; 6 months prior to 6-month interview; and 3 months prior to the 9 and 12 month interview). Appointment-keeping nonadherence was indicated by self-report of missing a glaucoma treatment appointment and not rescheduling during the specified time frame. Self-report of nonadherence in any of these three areas classified the subject as nonadherent.

This was a tailored phone call followed up by print materials.

control

The adherence measure, developed and pilot tested by the I-SIGHT study team, assessed compliance adherence with medication taking, refills, and appointment-keeping by self-report and chart review. Subjects were considered nonadherent with medication-taking if they reported missing doses of any glaucoma medication within one month of the interview. Levels of medication-taking nonadherence were also examined by missed doses within 7 days, 2 weeks, or 1 mo of the interview. Nonadherence with refills was defined as running out of any glaucoma medication and missing a dose within a specified time frame (i.e. 1 year prior to the baseline interview; 6 months prior to 6-month interview; and 3 months prior to the 9 and 12 month interview). Appointment-keeping nonadherence was indicated by self-report of missing a glaucoma treatment appointment and not rescheduling during the specified time frame. Self-report of nonadherence in any of these three areas classified the subject as nonadherent.

The two treatment groups were compared on change in the percent of adherent patients between baseline and follow-up using a longitudinal logistic regression model fit using a generalized linear model. A p-value less than 0.05 was considered statistically significant. No statistical comparison was done.