Antibiotics in Infancy and Weight A Canadian longitudinal study' examines whether giving antibiotics in infancy increases the likelihood that the child v later in life. The children were classified as having received antibiotics or not during the first year of life and then being not at 9 years old. The study included 616 children, and the results are shown in the table below. Overweight Not Overweight Total Antibiotics 144 294 438 No Antibiotics 37 141 178

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Antibiotics in Infancy and Weight
A Canadian longitudinal study examines whether giving antibiotics in infancy increases the likelihood that the child will be overweight
later in life. The children were classified as having received antibiotics or not during the first year of life and then being overweight or
not at 9 years old. The study included 616 children, and the results are shown in the table below.
Overweight | Not Overweight Total
Antibiotics
144
294
438
No Antibiotics
37
141
178
Total
181
435
616
Round your answers to three decimal places.
(a) What proportion of
children in the study were given
cibiotics during
first year of life?
i
(b) What proportion of all children in the study were classified as overweight at age 9?
i
(c) What proportion of those receiving antibiotics were classified as overweight at age 9?
i
(d) What proportion of those not receiving antibiotics were classified as overweight at age 9?
i
(e) If we use PA to denote the proportion from part (c) and Py to denote the proportion from part (d), calculate the difference in
proportion being overweight, PA – PN, between those that were exposed to antibiotics and those that weren't.
- PN
i
(f) What proportion of all children classified as overweight were given antibiotics during the first year of life?
i
1Azad MB, Bridgman SL, Becker AB, Kozyrskyj AL, "Infant antibiotic exposure and the development of childhood overweight and
central adiposity", International Journal of Obesity (2014) 38, 1290-1298.
Transcribed Image Text:Antibiotics in Infancy and Weight A Canadian longitudinal study examines whether giving antibiotics in infancy increases the likelihood that the child will be overweight later in life. The children were classified as having received antibiotics or not during the first year of life and then being overweight or not at 9 years old. The study included 616 children, and the results are shown in the table below. Overweight | Not Overweight Total Antibiotics 144 294 438 No Antibiotics 37 141 178 Total 181 435 616 Round your answers to three decimal places. (a) What proportion of children in the study were given cibiotics during first year of life? i (b) What proportion of all children in the study were classified as overweight at age 9? i (c) What proportion of those receiving antibiotics were classified as overweight at age 9? i (d) What proportion of those not receiving antibiotics were classified as overweight at age 9? i (e) If we use PA to denote the proportion from part (c) and Py to denote the proportion from part (d), calculate the difference in proportion being overweight, PA – PN, between those that were exposed to antibiotics and those that weren't. - PN i (f) What proportion of all children classified as overweight were given antibiotics during the first year of life? i 1Azad MB, Bridgman SL, Becker AB, Kozyrskyj AL, "Infant antibiotic exposure and the development of childhood overweight and central adiposity", International Journal of Obesity (2014) 38, 1290-1298.
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