Appendix 2.A BSI-18 Instrument
The interviewer read a list of problems and complaints that people sometimes have. The respondent answers each question with a descriptor that best describes how much discomfort that problem has caused the respondent during the past week, including the interview day.
Responses are measured on a five- point Likert scale: 0, not all; 1, a little bit; 2, moderately; 3, quite a bit; and 4, extremely.
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