Table 2.

Comparison of odds ratios of factors for using multifocal contact lenses

	Age group
Characteristics	40s	50s	60s
Age (y)	1.34 (1.24–1.45)**	1.11 (1.06–1.16)**	0.91 (0.89–0.98)*
Sex (man = 1)	1.64 (1.10–2.45)*	1.98 (1.54–2.54)**	1.28 (0.89–1.83)
Spherical equivalent (D)	1.01 (1.00–1.01)**	1.01 (1.00–1.01)**	1.01 (1.00–1.01)**
Magnitude of astigmatic errors (D)	0.99 (0.99–0.99)**	0.99 (0.99–0.99)**	0.99 (0.99–1.00)**
Magnitude of anisometropia (D)	1.00 (0.99–1.00)	0.99 (0.99–1.00)	0.99 (0.99–1.00)
Near add power (D)	1.11 (0.63–1.95)	0.69 (0.48–0.99)*	0.47 (0.26–0.83)*
Schirmer test (mm)	1.06 (1.00–1.11)*	1.01 (0.98–1.05)	1.12 (1.03–1.22)**
Tear break-up time (s)	1.09 (0.95–1.24)	1.11 (1.02–1.21)*	0.83 (0.69–0.99)*
SPK (yes/no)	0.73 (0.41–1.28)	0.54 (0.34–0.80)**	0.79 (0.40–1.57)

Each variable was analyzed in a separate model adjusted for age and sex. Odds ratio (95% confidence interval). *P < 0.05, **P < 0.01

SPK superficial punctate keratopathy