Factors were associated with OH include: age group 70 - 79 (OR = 2.95; 95% CI 1.56 - 5.58; p = 0.001); age group ≥80 (OR = 3.37; 95% CI 1.35 - 8.42; p = 0.009); polypharmacy (OR = 7.74; 95% CI 2.48 - 24.09; p <0.01); hypertension (OR = 7.01; 95% CI 2.88 - 17.09; p <0.01); diuretics (OR = 5.53; 95% CI 1.64 - 18.58; p=0.006); beta blockers (OR = 2.52; 95% CI 1.006 - 6.301; p = 0.048); pregabalin or gabapentin (OR= 4.19; 95% CI 1.45 - 12.14; p = 0.008).