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Seasonal variations of neuromotor development by 14 months of age: Hamamatsu Birth Cohort for mothers and children (HBC Study).

Tsuchiya KJ, Tsutsumi H, Matsumoto K, Takei N, Narumiya M, Honda M, Thanseem I, Anitha A, Suzuki K, Matsuzaki H, Iwata Y, Nakamura K, Mori N, H. B. C. Study Te - PLoS ONE (2012)

Bottom Line: Due to this complementary effect, gross motor scores at the 14th month did not show seasonality.Neuromotor development showed cyclic seasonality during the first year of life.The effects brought about by month of birth disappeared around 1 year of age, and warmer months seemed to accelerate the neuromotor development.

View Article: PubMed Central - PubMed

Affiliation: Research Center for Child Mental Development, Hamamatsu University School of Medicine, Hamamatsu, Japan. tsuchiya@hama-med.ac.jp

ABSTRACT
The present study aimed at investigating whether neuromotor development, from birth to 14 months of age, shows seasonal, cyclic patterns in association with months of birth. Study participants were 742 infants enrolled in the Hamamatsu Birth Cohort (HBC) Study and followed-up from birth to the 14th month of age. Gross motor skills were assessed at the ages of 6, 10, and 14 months, using Mullen Scales of Early Learning. The score at each assessment was regressed onto a trigonometric function of months of birth, with an adjustment for potential confounders. Gross motor scores at the 6th and 10th months showed significant 1-year-cycle variations, peaking among March- and April-born infants, and among February-born infants, respectively. Changes in gross motor scores between the 10th and 14th months also showed a cyclic variation, peaking among July- and August-born infants. Due to this complementary effect, gross motor scores at the 14th month did not show seasonality. Neuromotor development showed cyclic seasonality during the first year of life. The effects brought about by month of birth disappeared around 1 year of age, and warmer months seemed to accelerate the neuromotor development.

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Gross motor scores at the 6th (circle), 10th (square), and 14th (X) months of life, as assessed by the Mullen Scales of Early Learning, predicted by trigonometric function of months of birth.Footnotes: Each curve and dot indicates predicted values of gross motor scores at the 6th, 10th, and 14th month regressed onto a trigonometric function of months of birth, adjusted for maternal age at birth, gestational age at birth and birthweight, with 95% confidence intervals. Statistics for trigonometric function, amplitude and phase in month at the 6th month assessment: F(2, 736) = 21.71, p<0.001, Amplitude = 0.40 (95%CI: 0.39 to 0.41) points, phase in month = 0.52 (95%CI: 0.50 to 0.54) months. At the 10th month assessment: F(2, 736) = 12.36, p<0.001, Amplitude = 0.50 (95%CI: 0.49 to 0.51), phase in month = –0.82 (95%CI: –0.85 to –0.79) months. At the 14th month assessment: F(2,736) = 1.21, p = 0.30, amplitude and phase were undetermined; predicted values are mean of gross motor scores adjusted for maternal age at birth, gestational age at birth and birthweight.
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pone-0052057-g001: Gross motor scores at the 6th (circle), 10th (square), and 14th (X) months of life, as assessed by the Mullen Scales of Early Learning, predicted by trigonometric function of months of birth.Footnotes: Each curve and dot indicates predicted values of gross motor scores at the 6th, 10th, and 14th month regressed onto a trigonometric function of months of birth, adjusted for maternal age at birth, gestational age at birth and birthweight, with 95% confidence intervals. Statistics for trigonometric function, amplitude and phase in month at the 6th month assessment: F(2, 736) = 21.71, p<0.001, Amplitude = 0.40 (95%CI: 0.39 to 0.41) points, phase in month = 0.52 (95%CI: 0.50 to 0.54) months. At the 10th month assessment: F(2, 736) = 12.36, p<0.001, Amplitude = 0.50 (95%CI: 0.49 to 0.51), phase in month = –0.82 (95%CI: –0.85 to –0.79) months. At the 14th month assessment: F(2,736) = 1.21, p = 0.30, amplitude and phase were undetermined; predicted values are mean of gross motor scores adjusted for maternal age at birth, gestational age at birth and birthweight.

Mentions: According to these results, Figure 1 shows predicted curves for gross motor scores with 95% confidence intervals at 6, 10, and 14 months of age, regressed onto the trigonometric function of month of birth, with an adjustment for maternal age at birth, birthweight and gestational age at birth. As can be seen from the Figure, the predicted gross motor score at 6 months of age peaked among March- and April-born infants, and was lowest among September- and October-born infants. The predicted gross motor score at the 10 months also showed significant monthly fluctuations, and peaked among February-born infants. The phase (θ0) of the sine function at 10 months of age was slightly shifted toward early months with a predicted value of –0.82 months.


Seasonal variations of neuromotor development by 14 months of age: Hamamatsu Birth Cohort for mothers and children (HBC Study).

Tsuchiya KJ, Tsutsumi H, Matsumoto K, Takei N, Narumiya M, Honda M, Thanseem I, Anitha A, Suzuki K, Matsuzaki H, Iwata Y, Nakamura K, Mori N, H. B. C. Study Te - PLoS ONE (2012)

Gross motor scores at the 6th (circle), 10th (square), and 14th (X) months of life, as assessed by the Mullen Scales of Early Learning, predicted by trigonometric function of months of birth.Footnotes: Each curve and dot indicates predicted values of gross motor scores at the 6th, 10th, and 14th month regressed onto a trigonometric function of months of birth, adjusted for maternal age at birth, gestational age at birth and birthweight, with 95% confidence intervals. Statistics for trigonometric function, amplitude and phase in month at the 6th month assessment: F(2, 736) = 21.71, p<0.001, Amplitude = 0.40 (95%CI: 0.39 to 0.41) points, phase in month = 0.52 (95%CI: 0.50 to 0.54) months. At the 10th month assessment: F(2, 736) = 12.36, p<0.001, Amplitude = 0.50 (95%CI: 0.49 to 0.51), phase in month = –0.82 (95%CI: –0.85 to –0.79) months. At the 14th month assessment: F(2,736) = 1.21, p = 0.30, amplitude and phase were undetermined; predicted values are mean of gross motor scores adjusted for maternal age at birth, gestational age at birth and birthweight.
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Related In: Results  -  Collection

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pone-0052057-g001: Gross motor scores at the 6th (circle), 10th (square), and 14th (X) months of life, as assessed by the Mullen Scales of Early Learning, predicted by trigonometric function of months of birth.Footnotes: Each curve and dot indicates predicted values of gross motor scores at the 6th, 10th, and 14th month regressed onto a trigonometric function of months of birth, adjusted for maternal age at birth, gestational age at birth and birthweight, with 95% confidence intervals. Statistics for trigonometric function, amplitude and phase in month at the 6th month assessment: F(2, 736) = 21.71, p<0.001, Amplitude = 0.40 (95%CI: 0.39 to 0.41) points, phase in month = 0.52 (95%CI: 0.50 to 0.54) months. At the 10th month assessment: F(2, 736) = 12.36, p<0.001, Amplitude = 0.50 (95%CI: 0.49 to 0.51), phase in month = –0.82 (95%CI: –0.85 to –0.79) months. At the 14th month assessment: F(2,736) = 1.21, p = 0.30, amplitude and phase were undetermined; predicted values are mean of gross motor scores adjusted for maternal age at birth, gestational age at birth and birthweight.
Mentions: According to these results, Figure 1 shows predicted curves for gross motor scores with 95% confidence intervals at 6, 10, and 14 months of age, regressed onto the trigonometric function of month of birth, with an adjustment for maternal age at birth, birthweight and gestational age at birth. As can be seen from the Figure, the predicted gross motor score at 6 months of age peaked among March- and April-born infants, and was lowest among September- and October-born infants. The predicted gross motor score at the 10 months also showed significant monthly fluctuations, and peaked among February-born infants. The phase (θ0) of the sine function at 10 months of age was slightly shifted toward early months with a predicted value of –0.82 months.

Bottom Line: Due to this complementary effect, gross motor scores at the 14th month did not show seasonality.Neuromotor development showed cyclic seasonality during the first year of life.The effects brought about by month of birth disappeared around 1 year of age, and warmer months seemed to accelerate the neuromotor development.

View Article: PubMed Central - PubMed

Affiliation: Research Center for Child Mental Development, Hamamatsu University School of Medicine, Hamamatsu, Japan. tsuchiya@hama-med.ac.jp

ABSTRACT
The present study aimed at investigating whether neuromotor development, from birth to 14 months of age, shows seasonal, cyclic patterns in association with months of birth. Study participants were 742 infants enrolled in the Hamamatsu Birth Cohort (HBC) Study and followed-up from birth to the 14th month of age. Gross motor skills were assessed at the ages of 6, 10, and 14 months, using Mullen Scales of Early Learning. The score at each assessment was regressed onto a trigonometric function of months of birth, with an adjustment for potential confounders. Gross motor scores at the 6th and 10th months showed significant 1-year-cycle variations, peaking among March- and April-born infants, and among February-born infants, respectively. Changes in gross motor scores between the 10th and 14th months also showed a cyclic variation, peaking among July- and August-born infants. Due to this complementary effect, gross motor scores at the 14th month did not show seasonality. Neuromotor development showed cyclic seasonality during the first year of life. The effects brought about by month of birth disappeared around 1 year of age, and warmer months seemed to accelerate the neuromotor development.

Show MeSH