TABLE V.
Distribution of Nonsyndromica Amelia Cases by Number of Affected Limbs, Upper/Lower Limb Involvement and Laterality of the Defect, Among 20 Surveillance Programs of the International Clearinghouse for Birth Defects Surveillance and Research
| N | % | % of Total cases | |
|---|---|---|---|
| Monomelic | |||
| Upper right | 38 | 25.0 | |
| Upper left | 44 | 28.9 | |
| Lower right | 38 | 25.0 | |
| Lower left | 32 | 21.1 | |
| Total monomelic | 152 | 100 | 65.2 |
| Dimelic | |||
| Upper/upper | 47 | 61.8 | |
| Lower/lower | 23 | 30.3 | |
| Upper/Lower | 6 | 7.9 | |
| Total dimelic | 76 | 100 | 32.6 |
| Trimelic | 1 | — | 0.4 |
| Tetramelic | 4 | — | 1.7 |
| Total (specified) | 233 | — | 100 |
a
Syndromic cases (n = 7) were excluded for this and the following analyses.