Risedronate in the Prevention of Osteoporosis in Postmenopausal Women

Primary Objective: * To demonstrate that risedronate 35-mg once weekly is more efficacious than placebo in increasing or maintaining bone mineral density (BMD) of the lumbar spine after 1 year of treatment in women who are non-osteoporotic and 0.5-5 years postmenopausal. Secondary objectives: * To demonstrate that risedronate 35-mg once weekly is more efficacious than placebo in increasing or maintaining total proximal femur, femoral neck, and trochanter BMD after 1 year of treatment in women who are 0.5-5 years postmenopausal * To assess the general safety of 35-mg risedronate administered once weekly.