INS and diabetes mellitus: These include more general issues such as general diabetes worries, overall treatment satisfaction, and treatment preference - all of which could apply to any diabetes therapy and could potentially discriminate among therapies, perceptions of insulin convenience, ease of use, facilitation of self-care, and clinical efficacy - which could apply to any insulin therapy and potentially discriminate inhaled and injected insulin therapy, and perceptions of the device used to deliver inhaled insulin that could apply only to an inhaled insulin delivery system.