Table 1.

Indicators used for the analysis.

Indicator	Definition
Dependent variable
Stockout	The existence of any zero-stock event in one or multiple vaccination session in a vaccine-facility-month.
Independent variables
Intervention pre/post	Each observation is tagged as occurring either pre- or post-intervention roll-out.
Type of vaccine	Each observation involves a single vaccine commodity- (e.g. BCG vaccine)- known as a ‘Material’- thus vaccine-specific analyses and comparisons are possible.
Tenure using digital system	Each post-intervention stock event is tagged not only with the date of the transaction, but also the # immunization-days passed between intervention roll-out and that specific transaction. Thus analyses looking at improvements over time since roll-out are possible.