Risk factors for regret after tubal sterilization: 5years of follow-up in a prospective study**The Collaborative Review of Sterilization was supported in part by an interagency agreement between the Centers for Disease Control, Atlanta, Georgia, and by grant Y01-HD-41075 from the National Institute of Child Health and Human Development, Bethesda, Maryland; and by grant AI25529 to S.L.Z. from the National Institutes of Health.