[20 (link),21 ] The first three domains are covered by the Statutory Health Insurance (SHI) and the last by LTCI, which is a separate branch within the German social security system covering various community-based and institutional nursing care services. LTCI defines three care levels reflecting the applicant’s need for support in activities of daily living. Each level is connected to a fixed monthly tariff for community-living and institutionalized beneficiaries.
Long-term care utilization in the KORA-Age study was assessed by asking ‘Did you use services covered by the LTCI in the past 12 months?’ and, if ‘yes’, ‘Which care level are you assigned to?’.
For inpatient services, the number of hospital days was assessed by asking ‘Have you been hospitalized in the past 12 months?’ and, if ‘yes’, ‘How many days have you been hospitalized in the past 12 months?’. Outpatient services were assessed by asking the question, ‘How often did you see a physician (general practitioner or specialist) in the past 3 months?’. Finally, drug consumption was assessed in the postal questionnaire and covered the medications taken in the past 7 days including both prescribed and over-the-counter (OTC) drugs. Participants were asked to write down the exact name and central pharmaceutical number (PZN) for each medication. The PZN is a nationwide standardized identification number for proprietary medical products in Germany enabling a well-defined attribution of a pharmaceutical product including, for example, name, package size and defined daily dose (DDD).