“…The reported mean age of the patients at the time of the operation ranged from 30 to 43.2 years and the reported mean duration of postoperative follow-up ranged from 4.5 to 132 months. Fourteen studies [6,[18][19][20]22,23,28,29,33,34,39,40,42,43] contained groups that were matched for age at operation, 15 [3,6,[18][19][20]22,23,28,29,33,34,39,[42][43][44] for gender, 15 [3,[17][18][19][21][22][23][27][28][29]32,33,40,43,44] for the underlying disease requiring restorative proctocolectomy, 10 [6,17,24,25,28,…”