| Age category | Number of studies | ||
| High burden | Intermediate burden | Low burden | |
| Infants | 0 | 0 | 1 (Awasthi 2001 (Cluster)) |
| Infant, young, preschool, school | 0 | 0 | 1 (Donnen 1998) |
| Young | 0 | 0 | 2 (Joseph 2015; Ndibazza 2012) |
| Young, preschool | 0 | 0 | 2 (Awasthi 1995 (Cluster); Awasthi 2000) |
| Young, preschool, school | 0 | 1 (Alderman 2006 (Cluster)) | 0 |
| Preschool | 0 | 3 (Dossa 2001; Gupta 1982; Sur 2005) | 0 |
| School | 6 (Gateff 1972; Hall 2006 (Cluster); Miguel 2004 (Cluster); Ostwald 1984; Stephenson 1993; Watkins 1996) | 2 (Kruger 1996; Liu 2017 (Cluster)) | 0 |
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