INS and diabetes mellitus: These included advanced age (AOR: 4.32, 95% CI: 0.61–11.21, p = 0.012), duration of diabetes mellitus > 10 years (AOR: 3.60, 95% CI: 1.05–9.82, p = 0.019), insulin therapy (AOR: 3.13, 95% CI: 0.55–11.01, p = 0.009) and the presence of hypertension (AOR: 2.88, 95% CI: 0.75–5.45, p = 0.030) [Table 5].