Appendix 1.
Variables assessed in the questionnaire.
| Variable category | Variable | Number of items | Response scale | Cronbach’s α | Ref. |
|---|---|---|---|---|---|
| Annoyance | Aircraft noise annoyance in the last 12 months before the interview | 2 | intensity scales: verbal 5-pt., numerical 11-pt. | 34 | |
| Disturbances of activities due to aircraft noise | …of communication indoor | 3 | 5-pt. intensity scale; mean score | 0.92 | |
| …of communication outdoor | 1 | ||||
| …of relaxation/concentration indoor | 2 | 0.93 | |||
| …relaxation outdoor | 1 | ||||
| …nocturnal sleep | 3 | 0.92 | |||
| Coping with aircraft noise | Measures done within an aircraft noise situation (coping) | 16 | 5-pt. frequency scale; mean score | 0.94 | |
| Air traffic related attitudes | Fears concerning air traffic | 4 | 5-pt. intensity scale; mean score | 0.86 | |
| Confidence in authorities’ effort for aircraft noise reduction | 7 | 0.86 | |||
| Expectation concerning airport expansion | |||||
| Negative expectation | 6 | 5-pt. intensity scale; mean score | 0.91 | ||
| Positive expectation | 3 | 0.71 | |||
| Economic expectation | 2 | 0.76 | |||
| Residential satisfaction | Satisfaction with dwelling | 1 | 5-pt. intensity scale | ||
| Satisfaction with residential area | 1 | 5-pt. intensity scale | |||
| Satisfaction with infrastructure (6 items), attractiveness of residential area (3 items), quietness (3 items) | 12 | 5-pt. intensity scale; subscores and total score: mean scores | 0.82 | 32 | |
| Health-related quality of life (HQoL) | Vitality (SF-36) | 4 | SF subscales: Transformed scale with values between 0 and 100. Higher values indicate higher HQoL | 35 | |
| Mental health (SF-36) | 5 | 35 | |||
| Mental health (SF-12) | 6 | 35 | |||
| Physical health (SF-12) | 6 | 35 | |||
| Health complaints (GSCL 24): exhaustion (6 items); stomach (6), limbs (6); cardiac (6), total (24) | 24 | Subscores transformed to scale from 0 to 100. Reference sample [36]: mean = 50, SD = 10 | 36 | ||
| Health diseases (morbidity) | Self-reported diagnosed diseases; Multimorbidity: 0–1 diseases vs. 2 or more diseases | 18 | ever had; in the last 12 months; dichotomized | 37;38 | |
| Sleep | Sleep quality (PSQI total index) | 18 | sum score: 0 to 21; values > 5 = bad quality | 39 | |
| Personal factors | Noise sensitivity (single item) | 1 | 5-pt. intensity scale | ||
| Age | |||||
| Gender | female / male | ||||
| House ownership | tenant / owner | ||||
| Socio-economical status ‘Scheuch-Winkler index’ | 3 | includes income, education, occupational status | 40 | ||