Table 1 Mixed methods evaluation strategy, sample, goal, data collection timing, and analysis

Process metrics

All patients referred for TB diagnostic evaluation at intervention sites

Examine variability in adoption of and fidelity to intervention components across sites

Entire post-randomization period

Multivariate regression models

Surveys

1) Health workers involved in TB evaluation at all sites*

2) Sixty patients per site (20 patients/site, 400 total pre-randomization; 40 patients/site, 800 total post-randomization)**

Examine whether the XPEL TB strategy modifies targeted barriers to TB diagnostic evaluation

Once before and once after trial is completed

Multivariate regression models

Focus groups

Health workers involved in TB evaluation at intervention sites*

Assess acceptability of each component of the intervention strategy.

After trial is completed

Thematic interpretation

In-depth interviews

Purposive: 20–30 health workers at high- and low-performing intervention strategy sites (2–3/site)

Understand reasons for variability in adoption and implementation of the XPEL TB strategy

After trial is completed

Thematic interpretation