Fig. 2
From: Health system determinants of tuberculosis mortality in South Africa: a causal loop model
Causal loop diagram describing factors affecting TB mortality in South Africa, developed through group process. O: opposite; R: reinforcing; S: same; TB: tuberculosis. Variables in black reflect the key variables identified and variables in grey reflect additional explanatory variables that were added. Three colours were used to differentiate the reinforcing loops discussed in this paper, orange: Loop1; blue: Loop 2; purple: Loop 3