Table 1. Calculation of summary scores in study of loss to follow-up during treatment for multidrug-resistant TB, the Philippines, 2012–2014*.

Score type	Score calculation	Score interpretation
General TB knowledge, including understanding of severity of the disease and susceptibility to the disease	Participants were asked 15 questions that focused on 1) the severity of the TB problem in their community, 2) TB transmission and morbidity/mortality, and 3) TB treatment. Each item answered correctly was awarded 1 point. Incorrect answers or “Not sure” responses received 0 points. The summary score was extrapolated onto a scale of 100 and reported as a percentage by using the following formula: General TB knowledge score = (total points earned/15) × 100 (i.e., score is calculated on a scale of 0–100%).	A higher score may indicate greater TB knowledge and greater perceived severity and susceptibility to the disease.
Expectations related to TB and its treatment	Participants were asked 5 interview questions aimed at determining their concerns for passing TB to loved ones, relapsing, and developing worsening drug resistance. Possible range of scores 5–15.	A higher score may indicate greater concerns or an expectation that TB could cause problems in the future. In addition to factors such as knowledge, attitudes, and beliefs, expected outcomes can determine a person’s actions. These expectations may be derived from 1) previous experiences, 2) observing or hearing about others in similar situations, 3) persuasive conversations, or 4) emotional or physical responses.
Self-efficacy (or confidence) to adhere to treatment at the time treatment was about to begin	Eight interview questions were included in the self-efficacy questionnaire. “Very confident” = 3 points, “A little confident” = 2 points, “unsure” = 1 point, and “I knew I could not do this” = 0 points. The score for each item would be added together to calculate a cumulative self-efficacy score. Possible range of scores 0–24 points.	A higher score may indicate a high degree of self-reported self-efficacy for adhering to treatment regimen, coping with the treatment, and meeting with DOT staff when about to start treatment.
Social support from family and friends	Score was based on responses to 3 interview questions with possible range of scores 3–15.	Lower scores may indicate less support.
Trust in, rapport with, and support from physicians and nursing staff	An overall score was based on 22 items grouped together. Possible range of scores 22–110.	A higher score may indicate a greater level of trust, rapport, and perceived support. Items were separated by topic, and separate scores were also calculated for participants’ 1) trust in, and rapport with physicians (13 questions); 2) trust in, and rapport with nurses (5 questions); and 3) perceived support from health center staff (4 questions).
Patient self-stigmatization	A cumulative score for stigma was based on 2 interview questions. Possible range of scores 1–10.	A higher score may indicate less stigma.

*DOTS, directly observed therapy; TB, tuberculosis.