City University Calculate the Relative Risk of Low Birthweight Neonates Questions

PART B:The below table shows birth outcome data for Volusia county in a recent year.
The Health outcome studied here is “Low Birth Weight” (e.g. Less than 2500 g
for a full-term birth).
Age of the mother is known to correlate with low birth weight neonates.
1) Using “Age of mother” as a risk factor, calculate the risk of the birth of a
low birthweight infant in each age category.
2) Now calculate the relative risk of low birthweight neonates for each
age-group relative to mothers aged 25-29 (the referent group).
3) Which Age-groups have an apparent elevated, or lowered risk of low
birthweight neonates?
Age of
Mother
Total
Births
Normal
Births
Low
Birth
Weight
Risk
Relative
Risk
14-19
361
327
34
20-24
1313
1205
108
25-29
1402
1301
101
30-34
971
897
74
35-39
478
428
50
40-44
99
89
10
45-49
8
7
1