Table 4.

Determinants of medication adherence at baseline in percentage points of adherent days

Baseline characteristic	Estimate	95% CI
Average no. of daily doses	– 4.83**	– 8.58 to – 1.07
Female	3.71	– 8.95 to 16.4
Age	0.018	– 0.698 to 0.734
Mandarin-speaking	5.65	– 8.85 to 20.1
Married	– 3.30	– 17.0 to 10.4
Highest level of education
Primary and lower	(reference)	(reference)
Secondary	10.3	– 7.19 to 27.9
Tertiary	– 3.80	– 22.5 to 14.9
Employed	– 2.49	– 16.8 to 11.8
Household monthly income
<  $US2000	(reference)	(reference)
$US2000–3999	– 1.72	– 22.1 to 18.7
$US4000–5999	6.54	– 15.4 to 28.5
≥  $US6000	10.1	– 16.0 to 36.1
Intraocular pressure	0.075	– 1.28 to 1.43
Taking other medication	– 10.8	– 25.9 to 4.25
BMQ score	0.167	– 0.784 to 1.12
BIPQ score	– 0.053	– 0.689 to 0.582
Constant	83.5**	13.1 to 154

Source: author calculations using the data collected from the study

BIPQ Brief Illness Perception Questionnaire, BMQ Beliefs about Medication Questionnaire, CI confidence interval

*Statistically significant at the 10% level; **statistically significant at the 5% level