IHP 340 Module Six Worksheet (1) - Copy

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Southern New Hampshire University *

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340

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Statistics

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Apr 3, 2024

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Module Six Worksheet Identification of Methods and Interpretation of Results Prompt : Review Table 1 below and then complete the Module Six Worksheet steps. Note: the chi-square (c 2 ) test is covered in Module Seven. Table 1: Characteristics of Women According to Intake of Alcohol Variable Nondrinker* Drinker* Test Statistic** P value Mean age of mother at birth (years) 28.2 + 4.4 30.1 + 4.4 19.16 <.0001 % of mothers with education > 12 years 71.1% 77.6% 226.9 <.0001 % of mothers who smoked during pregnancy 7.5% 12.0% 100.7 <.0001 Prepregnancy BMI (kg/m 2 ) 23.8 + 4.6 23.7 + 4.3 0.8 0.469 Note: intake of alcohol was during pregnancy except for prepregnancy BMI comparison where drinking status was also prepregnancy. *Continuous variables presented by mean + standard deviation, categorical variables as % ** Test statistic is either a  2 value or a t-value Reference: Dale, M. T. G., Bakketeig, L. S., and Magnus, P. (2016). Alcohol consumption among first-time mothers and the risk preterm birth: A cohort study. Annals of Epidemiology 26, 275–282 Steps : For this assignment, complete the following steps: 1. Complete this worksheet by replacing the bracketed text with the relevant information. Use Table 1 as your source of information. Use the provided completed cells in the matrix to help you fill in the rest of the cells. 1

Variable 1 Variable 2 Name of Variable 1 (Provide Units or Categories) Quantitative (continuous) or Categorical? Name of Variable 2 (Provide Units or Categories) Quantitative (continuous) or Categorical? Appropriate Statistical Test to use Corresponding Research Question P value Pregnancy BMI Quantitative Drinker type (nondrinker or drinker) Categorical Two-sample independent t-test Is the BMI amongst the 2 drinking type mothers different? 0.469 Percentage of mothers with an education >12 years Categorical Drinker type (Alcoholic consumption or non- alcoholic consumption) Categorical Chi square test Did the amount of education received vary by mothers who drank and those who did not? <0.0001 Pre-pregnant intake of alcohol (drinker vs nondrinker) Categorical Smoked during pregnancy (y/n) Categorical Chi square test Is there a difference in the percentage of mothers who smoked during pregnancy versus the mothers of the drinker and non-drinker groups? <0.0001 Drinker type (nondrinker or drinker) Categorical Age of mother when child is born (years) quantitative (continuous) Two sample independent T-test. Does the age of mothers vary between the two drinking types? <.0001 Write out a complete answer to each of the four research questions stated in the matrix. Be sure to state what is being compared and what group or groups did better and by how much. Is the BMI amongst the 2 drinking type mothers different? •The T-test indicates there is no relationship between the Body Mass Index of a drinker versus a nondrinker mother becoming pregnant and her age at the time when their child is born. 2

Did the amount of education received vary by mothers who drank and those who did not? •The Chi-square test data indicates a substantial statistical difference between mothers of the two drinking types. The data presented shows that mothers with more than 12yrs of education are among the non-drinkers. The p-value confirms this by being <0.0001. The difference is 77.6- 77.1-0.5%. Is there a difference in the percentage of mothers who smoked during pregnancy versus the mothers of the drinker and non-drinker groups? •The Chi-square indicates there is a significant difference between the mothers who drank versus those who did not drink during pregnancy. Once again, the p-value indicates this by being <0.0001. In contrast to non-drinkers, drinkers have a higher percentage; the difference is 12-7.5 = 3.5%. • Does the age of mothers vary between the two drinking types? Based on the data provided there looks to be a significant amount of variation between the two groups of drinkers and non-drinkers. This is determined by the evidence found on the p-value which is shown to be <0.0001. The difference is 30.1-28.2=1.9. 2. Were the values of BMI more varied among the women who drank or did not drink prior to getting pregnant? Explain how you know this. • The data shows that the mean BMI value for a non-drinker is 23.8kg/m2 with a slight variance of 4.6kg/m2 while the level of drinkers is 23.7kg/m2. As you can see there is no difference between the two drinking types and their BMI values, however studies have been done in the past proving that both men and women BMI values increase when they increase their alcohol intake. The body stores those calories from alcohol as fats which cause your BMI value to increase. 3

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