ACE and benign prostatic hyperplasia: A significant association between angiotensin-converting enzyme (ACE) insertion/deletion (I/D) polymorphism and risk of BPH was observed under the recessive (II vs. ID + DD) model (OR = 1.67, 95% CI = 1.03–2.73), but not in the dominant (II + ID vs. DD) model (OR = 1.0, 95% CI = 0.75–1.35) (Table 2, Fig. 2).