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Stuttering incidence reported in 21st Century studies
| Study | Sample size | Participants | Percent incidence |
|---|---|---|---|
| Mansson (2000) | 1040 | All children born during 2 years |
5.09% |
| Felsenfeld et al. (2001) | 3768 | Adult Twins | 8.80% |
| Craig et al. (2002) | 12,131 | Entire age range | 3.22% |
| Månsson (2005) | 928 | 92% of children born during 2 years |
17.70 % |
| Dworzynski, et al. (2007) | 12,892 | Twin pairs ages 2–7 | 8.40 |
| Reilly et al. (2009) | 1,619 | Preschool | 8.50% |
