Table 3.
Sampling methods used for surveys in SNUsa with at least 3 data points for any KPb (Nc=68).
| Sampling methods | KPs | |||||||
|
|
|
SWsd (Ne=416) | MSMf (Ne=280) | People who inject drugs (Ne=249) | Transwomen (Ne=57) | |||
|
|
Nonprobability sampling, n (%) | |||||||
|
|
|
Cluster | 34 (8.2) | 10 (3.6) | 17 (6.8) | 5 (8.8) | ||
|
|
|
Convenience | 32 (7.7) | 18 (6.4) | 10 (4.0) | 2 (3.5) | ||
|
|
|
Facility-based | 15 (3.6) | 13 (4.6) | 15 (6.0) | 6 (10.5) | ||
|
|
|
Snowball | 62 (14.9) | 99 (35.4) | 74 (29.7) | 13 (22.8) | ||
|
|
|
Other nonprobability sampling | 3 (0.7) | 11 (3.9) | 8 (3.2) | 0 (0) | ||
|
|
Probability sampling, n (%) | |||||||
|
|
|
Proportionate to population size | 12 (2.9) | 5 (1.8) | 3 (1.2) | 2 (3.5) | ||
|
|
|
Respondent-driven sampling | 9 (2.2) | 4 (1.4) | 4 (1.6) | 3 (5.3) | ||
|
|
|
Systematic, simple random, or stratified | 41 (9.9) | 14 (5.0) | 12 (4.8) | 7 (12.3) | ||
|
|
|
Time-location sampling | 14 (3.4) | 7 (2.5) | 7 (2.8) | 2 (3.5) | ||
|
|
Unknown, n (%) | 194 (46.6) | 99 (35.4) | 99 (39.8) | 17 (29.8) | |||
aSNU: Subnational unit.
bKP: key population.
cTotal number of countries.
dSWs: sex workers.
eTotal number of SNUs with at least 3 data points.
fMSM: men who have sex with men.