TABLE 3. Calculations and limitations on the PTB care cascade in the indigenous population of Cauca, Colombia (2016-2017).

Steps and gaps	Calculation
Step 1	Assumption 1. Proportion of over-15s in the population projection for the department of Cauca for 2016 = 72.1%
	Assumption 2. Proportion of over-15s in the population projection for the department of Cauca for 2017 = 72.5%
	Assumption 3. Projected indigenous population in the Department of Cauca for 2016 = 344,922
	Assumption 4. Projected indigenous population in the Department of Cauca for 2017 = 287,295
	Assumption 5. Indigenous population over age 15 in 2016 = Assumption 3 × Assumption 1 / 100 = 248,668
	Assumption 6. Indigenous population over age 15 in 2017 = Assumption 4 × Assumption 2 / 100 = 208,288
	Assumption 7. 50% of over-15s in indigenous population in 2016-2017 = Assumption 5 + Assumption 6 × 0.5 = 228,478
	Assumption 8. 5% of over-15s in indigenous population in 2016-2017 = Assumption 7 × 0.05 = 11,423
	Assumption 9. Total expected RS in the indigenous population of Cauca in Colombia in 2016-2017 = 11,423
	Assumption 10. Observed positivity rate for SS microscopy in Colombia in 2015 = 1.77%
	Total expected RS in the indigenous population of Cauca in Colombia in 2016-2017 = Assumption 9 × Assumption 10 / 100 = 202
Gap 1	Total undiagnosed PTB patients = Step 1 – Step 2 = 96
Step 2	Total number of PRI with PTB in 2016-2017 = 106
Gap 2	Total number of patients diagnosed with PTB who did not start treatment in 2016-2017 = Step 2 – Step 3 = 0
Step 3	Total number of PRI with PTB in 2016-2017 who started treatment =106
Gap 3	Assumption 1. Total number of PRI with PTB in 2016-2017 who started treatment and died during follow-up = 5
	Assumption 2. Total number of PRI with PTB in 2016-2017 who started treatment and were lost to follow-up = 1
	Assumption 3. Total number of PRI with PTB in 2016-2017 who started treatment and were not evaluated during follow-up, according to Cauca departmental TB control database = 1
	Total number of patients with treatment failure, death, or loss to follow-up = Assumption 1 + Assumption 2 + Assumption 3 = 7
Step 4	Total number of PRI with PTB in 2016-2017 who were cured or completed treatment = 99
Gap 4	Assumption. Total number of PRI with PTB in 2016-2017 who started then completed treatment and died during the 18 months after completing the program = 0
Step 5	Total number of RIP with PRI in 2016-2017 who started then completed treatment and remained alive 18 months after completing the program = Step 4 - Gap 4 = 99

Source: the authors.

RS: respiratory symptomatics; PRI: patients reported as indigenous; PTB: pulmonary tuberculosis.