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Conditional variables at birth and 4 months old
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Total
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Communication
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Gross motor
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Fine motor
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Problem solving
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Personal-Social
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2,432/30,358 (8.0 %)
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584/30,504 (1.9 %)
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468/30,505 (1.5 %)
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743/30,436 (2.4 %)
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1,113/30,510 (3.6 %)
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290/30,476 (1.0 %)
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Length at birth
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0.99 (0.95–1.05)
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1.04 (0.93–1.16)
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1.12 (0.99–1.26)
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0.98 (0.89–1.07)
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0.96 (0.89–1.04)
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0.90 (0.78–1.05)
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Weight at birth
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0.93 (0.88–0.98)
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0.93 (0.84–1.04)
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0.83 (0.73–0.94)
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0.96 (0.87–1.06)
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0.95 (0.88–1.02)
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0.94 (0.81–1.10)
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cLength at 4 months old
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0.87 (0.83–0.91)
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0.86 (0.78–0.94)
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0.89 (0.81–0.99)
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0.88 (0.81–0.96)
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0.83 (0.78–0.89)
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0.80 (0.72–0.91)
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crWeight at 4 months old
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1.05 (0.99–1.11)
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0.92 (0.82–1.03)
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1.44 (1.26–1.63)
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0.99 (0.89–1.10)
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0.99 (0.91–1.07)
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1.14 (0.97–1.34)
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- Data represent the adjusted relative risk (95 % confidence interval). All of the conditional variables and the following covariates were included together in the model: maternal age and smoking, maternal and paternal education, family income, and home speech stimulation.
- cLength conditional length; crWeight conditional relative weight
