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| Number of newly enrolled patients on ART per year | Required sample size |
|---|---|
| 1-75 |
Recruit all |
| 76-110 |
75 |
| 111-199 |
100 |
| 200-250 |
110 |
| 251-299 |
120 |
| 300-350 |
130 |
| 351-400 |
135 |
| 401-450 |
140 |
| 451-550 |
145 |
| 551-700 |
155 |
| 701-850 |
160 |
| 851-1600 |
175 |
| 1601-2150 |
175 |
| 2151-4340 |
200 |
| 4341-5670 |
210 |
| 5671-10,000 |
215 |
| >10,000 | WHO advice required |
WHO: World Health Organization.
