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Table 1.

Demographic characteristics of study subjects.

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Table 1 Expand

Figure 1.

Interactive dot diagrams of trisomy 18 and 21.

(A) Interactive dot diagram of trisomy 18. (B) Interactive dot diagram of trisomy 21.

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Figure 1 Expand

Table 2.

Positive predictive and negative predictive values in this study.

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Table 2 Expand