Descriptive statistics were used to describe patients’ characteristics
along with their knowledge, satisfaction and concern scores. Pearson’s
Chi-Square test and independent-samples t-test were used where appropriate
to compare socio-demographic and clinical characteristics between
respondents and non-respondents. Independent-samples t-test
and Mann Whitney U test were used where appropriate to compare
the difference in knowledge, satisfaction, and concern scores between
patients with and those without good INR control. Correlations between
knowledge and satisfaction scores were examined using Pearson’s correlation
analysis. Spearman’s correlation analysis was used to examine
1) the correlations of concern scores with knowledge and satisfaction
scores, and 2) the correlations of warfarin refill adherence with knowledge,
satisfaction and concern scores. All analyses were performed
using SPSS version 21.0. The level of significance was set at probability
(p) b 0.05.
Results
Patient characteristics
Among the 258 patients approached, 183 agreed to participate in the
survey, giving a response rate of 70.9%. Patients’ characteristics are shown
in Table 1. Respondentswere evenly distributed between the two genders
(49.2% male) and the two language versions (54.6% English) and had a
mean ± SD age of 56.1 ± 13.0 years and mean ± SD warfarin refill adherence
of 92.0 ± 16.8%. A majority of respondents had TTR of less than
90% (61.2%). Non-respondents were older (p = 0.002) and more likely
to speak Chinese (p = 0.02).