“…In the remaining seven studies data collection for both groups was retrospective. Seven retrospective studies included matched groups [Polascik, 1995;Kohli, 1997;Loveridge, 1997;Miannay, 1998;Saidi, 1998;Bezerra, 2004;Huang and Yang, 2004], as follows: age [Polascik, 1995;Kohli, 1997;Loveridge, 1997;Miannay, 1998;Saidi, 1998;Bezerra, 2004;Huang and Yang, 2004], parity [Kohli, 1997;Loveridge, 1997;Miannay, 1998;Saidi, 1998;Bezerra, 2004;Huang and Yang, 2004], menopausal state [Saidi, 1998;Bezerra, 2004;Huang and Yang, 2004], HRT use [Saidi, 1998;Bezerra, 2004], previous abdomino-pelvic surgery [Polascik, 1995;Kohli, 1997;Loveridge, 1997;Miannay, 1998;Huang and Yang, 2004] and detrusor instability [Polascik, 1995;Bezerra, 2004].…”