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）。
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。
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。
The infants MDI differed in the type of family and had obvious discrepancy (P<0.05), but the PDI had no significant discrepancy.
家庭类型不同的婴幼儿之间MDI差异有统计学意义（P<0.05），而PDI差异无统计学意义。
The mental development index (MDI) and the psychomotive development index (PDI) at 18 months in the intervention group were much higher than those of the control group (P <0. 001 ).
两组在18个月龄的智力发育指数（MDI），运动发育指数（PDI）干预组明显高于对照组（P〈0．001）；
Results Mental development index(MDI) and physical development index(PDI) in early interventional group were significant higher than those in group 2(P<0.05, < 0.001).
结果干预组智力及精神运动发育指数明显高于非干预组（P<0.05，<0.001），而与正常对照组比较无明显差异（P>0.05）；
Results Mental development index(MDI) and physical development index(PDI) in early interventional group were significant higher than those in group 2(P<0.05, < 0.001).
结果干预组智力及精神运动发育指数明显高于非干预组（P<0.05，<0.001），而与正常对照组比较无明显差异（P>0.05）；
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