Question

1.4 An investigator reviewed 700 singleton birth records that occurred during the past 5 years in St. Catharines General Hospital. A total of 56 records were identified as low birth weight infants (birth weight less than 2500 grams). He also identified another 56 infants whose birth weight were higher than 2500 grams, but who was born at the same day with the same sex as the one in low birth weight group. Each infant's mother was interviewed to examine whether cigarette smoking exposure was associated with the fetus' birth weight. a) What is the type of the study? b) How many factors are involved in this study? What are they? c) What are the measurement scales for these factors?

Answer 1

An investigator eviewed 7o0 Singleton birth tecotds that occurrred during th urrred duming the past 5 yeas in t Cathatines Gtenetal HoSpital Gliven That- a) The type op the study We know that i an observational study the invesligators do not assiąn any treatments but observe Subjects and Measures vatiables of inlerest without assigning treatment to the Subject. Here e ind the Same type of sudy Wlhen investigators Seviewed Too singleton birth tecords thad o ccurred durini tthe past 5 years 30 this is an observatiohal Stud atioha td b) How Many Factors are involved in this study Here we have 5 vatja bles and the are as belou yeaT, Dut Bith weight, sex Smoking habit c) The Measurement scales fo these Pactors Date → interval year→ interval Birth weight → Ratio Sex → Nominal Smoking habit Nominal