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Table 1 Sonographic parameters

From: Evaluation of sensitivity and accuracy of maternal serum alpha fetoprotein to the diagnosis of open spina bifida in comparison with sonographic findings of open spina bifida and Chiari II malformation in pregnant women

Variables Range (min–max) Mean SD
AFP 1.98–5.81 3.0225 .77866
CM 0.5–6.7 4.295 1.3629
BS 2–5.1 2.304 .4247
BSOB 3.5–1.7 3.183 .2744
BS/BSOB 0.6–1.8 .7266 .21557
Maternal age (y) 18–39 29.87 5.278
Fetal age (w) 12–20 17.11 2.492