. Author manuscript; available in PMC: 2020 Oct 1.

Published in final edited form as: Cont Lens Anterior Eye. 2019 Mar 16;42(5):557–561. doi: 10.1016/j.clae.2019.03.001

Table 1:

Univariate and multivariate analyses of lens replacement compliance compared to age, gender, years of contact lens wear, manufacture’s recommended replacement schedule (MRS), and overnight wear compliance in participants (n = 297) who were compliant (C) and noncompliant (NC) with their reported prescribed lens replacement schedules. MRS is listed as daily replacement (DR), monthly replacement (MR) and two-week replacement (2WR). Some overall percentages do not sum to 100% due to rounding.

	Lens Replacement Compliance (38.7% non-compliance, n = 115)
Age (years)			Univariate	Multivariate
	C	35.2 ± 11.6	p = 0.1^a t = 1.8	p = 0.02 OR = 0.96 95% Cl: 0.92–0.99
	NC	33.2 ± 8.1	p = 0.1^a t = 1.8	p = 0.02 OR = 0.96 95% Cl: 0.92–0.99
Gender	C	74.7% female	p = 0.4 X² = 0.8	p = 0.9 OR = 0.96 95% Cl: 0.52–1.76
Gender	NC	79.1% female	p = 0.4 X² = 0.8	p = 0.9 OR = 0.96 95% Cl: 0.52–1.76
Years of Contact Lens Wear	C	15.8 ± 9.7	p = 0.4^a t = −0.9	p = 0.02 OR = 1.05 95% Cl: 1.007–1.1
Years of Contact Lens Wear	NC	16.7 ± 7.2	p = 0.4^a t = −0.9	p = 0.02 OR = 1.05 95% Cl: 1.007–1.1
MRS	C	29.1% DR 34.6% MR 36.2% 2WR	p < 0.0001^b X² = 27.3	p < 0.0001^c
MRS	NC	6.1% DR 33.9% MR 60.0% 2WR	p < 0.0001^b X² = 27.3	p < 0.0001^c
Overnight Wear Compliance	C	81.3% compliant with ON wear	p = 0.008 X² = 7.1	p = 0.02 OR = 0.49 95% Cl: 0.27–0.88
Overnight Wear Compliance	NC	67.8% compliant with ON wear	p = 0.008 X² = 7.1	p = 0.02 OR = 0.49 95% Cl: 0.27–0.88

Levene’s Test for Equality of Variances revealed that equal variances could not be assumed (p < 0.05), so p and t-values reported in these cells are for independent t-tests when equal variances are not assumed.

Univariate individual comparisons of each MRS group showed that DR wearers were more likely to be compliant with replacement than 2WR ( X² = 27.1, p < 0.0001) and MR wearers (X² = 13.1, p < 0.0001). MR wearers were more likely to be compliant with replacement than 2WR wearers (X² = 3.9, p = 0.049).

Multivariate individual comparisons of each MRS groups showed that DR wearers were more likely to be compliant with lens replacement than 2WR wearers (OR = 6.8, 95% CI: 2.81 – 16.20, p <0.0001) and MR (OR = 4.40, 95% CI: 1.78 – 10.88, p = 0.001). There was no statistical difference in compliance with multivariate comparison of MR and 2WR wearers (OR = 0.70, 95% CI: 0.38 – 1.12, p = 0.1).