Table 2.

Outcome of logistic regression.

Factor	β	SE β	Wald's χ2	df	p	Odds ratio (95% CI)
Constant	−1.461	0.487	9.006	1	0.003	NA
Refractive error	0.340	0.137	6.104	1	0.013	1.404 (1.073–1.839)
Test			χ2	df	p
Overall model			6.757	1	0.009
Hosmer & Lemeshow (Goodness-of-fit)			8.700	7	0.275

All statistics were calculated using SPSS v25.0 (IBM Corp. Armonk, NY, USA). Further descriptive measures of goodness-of-fit given by Cox and Snell R² = 0.082, Nagelkerke R² = 0.111.