INS and retinal disorder: More insulin-treated patients had ischaemic heart disease (46.7% vs. 33.6%, p = 0.028), diabetic foot disease (15.6% vs. 4.8%, p = 0.003), retinopathy (40.2% vs. 11.0%, p < 0.001), and emergency attendance for severe hypoglycaemia (3.8% vs. 0% p = 0.042).