The document discusses using Pearson's correlation to analyze the relationship between a mother's body mass index (BMI) and birth weight. It indicates that Pearson's correlation is the most suitable test since BMI and birth weight are both continuous variables that are likely normally distributed. The results of running the Pearson's correlation on the data show a positive and fair correlation between a mother's BMI and birth weight, suggesting that as a mother's BMI increases so does the birth weight of their baby.

1. Running Pearson’s
Correlation on SPSS
http://www.palmx.org/drtamil/spss/
sga-ttest-youtube.sav

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Factors Affecting SGA
SGA
(Y/N)
(Birth
weight)
Mother’s
Nutrition
(BMI/Obesity)
•Weight
•Height
Smoking
Hypertension

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Dependent Outcome
 Birth weight of the babies
 Small for gestational age i.e. less than
2.7kg for term babies – Y/N
By Yehudamalul - Own work, CC BY-SA 3.0,

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What test to use?
 Conduct the appropriate statistical test to
test the strength of relationship between
MOTHERS’ BODY MASS INDEX (in kg) and
BIRTH WEIGHT (in kg).

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Factors Affecting SGA
Birth
weight
(in kg)
Proxy for
Mother’s
Nutrition; Body
Mass Index in
kg/m2
Smoking
(Y/N)
Hypertension
(Y/N)

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What test to use?
 Birth weight – interval/continuous data.
 Body Mass Index – interval/continuous
data.
 The aim here to show the strength and
direction of the relationship.
 Assuming both BMI & birth weight are
normally distributed, most suitable test is
Pearson’s Correlation.

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Relationship of BMI & Birth weight

9. Running Pearson’s
Correlation on SPSS
http://www.palmx.org/drtamil/spss/
sga-ttest-youtube.sav

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Results
Correlation coefficient; r = 0.432
This indicate that there is a positive and
fair association between mothers’ BMI
and birth weight.

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Conclusion
 There is a positive and fair association
between mothers’ BMI and birth weight.
 As the mothers’ BMI increases, the birth
weight of the babies also increases.
 Mother with BMI of 41, had a child of 4.72
kg.
 Mother with BMI of 17, had child of 1.92
kg.
 “Big Mothers Get Big Babies!”

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Exercise
 Repeat the same statistical test between;
◦ Mothers’ Age and Birth Weight
◦ Mothers’ Weight and Birth Weight
◦ Mothers’ Height and Birth Weight