Metal development index(MDI)and the psychomotor development index(PDI) comparatively divergence marked (P<0. 01).

智力发育指数和运动发育指数比较，差异显著（P<0．01）。

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By analysis of covariance we compared the difference of MDI and PDI between the two groups.

运用协方差分析法比较两组婴儿MDI和PDI的差异。

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By analysis of covariance the differences of MDI and PDI between the two groups were compared.

运用协方差分析法比较两组婴儿MDI和PDI的差异。

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