There was an error in table 1 of an article published in the May 2006 issue (Reginster J-Y, Adami S, Lakatos P, Greenwald M, Stepan JJ, Silverman SL. Efficacy and tolerability of once-monthly oral ibandronate in postmenopausal osteoporosis: 2 year results from the MOBILE study. Ann Rheum Dis 2006;65:654–661). In the header row of table 1 “50 + 5 mg monthly (n = 396)” should read “50 + 50 mg monthly (n = 396)”.