Does going to university in a different country affect your mental health? A Japanese international university surveyed its students in 2018 and published a study the following year that was approved by several ethical and regulatory boards.
The study found that international students have a higher risk of mental health difficulties than the general population, and that social connectedness (belonging to a social group) and acculturative stress (stress associated with joining a new culture) are predictive of depression.
Explore the students data using PostgreSQL to find out if you would come to a similar conclusion for international students and see if the length of stay is a contributing factor.
Here is a data description of the columns you may find helpful.
| Field Name | Description |
|---|---|
inter_dom | Types of students (international or domestic) |
japanese_cate | Japanese language proficiency |
english_cate | English language proficiency |
academic | Current academic level (undergraduate or graduate) |
age | Current age of student |
stay | Current length of stay in years |
todep | Total score of depression (PHQ-9 test) |
tosc | Total score of social connectedness (SCS test) |
toas | Total score of acculturative stress (ASISS test) |
-- Run this code to save the CSV file as students
SELECT *
FROM 'students.csv';--Count all records
SELECT COUNT(*) AS total
FROM students;--Count international and domestic students
SELECT inter_dom, COUNT(*) AS interdom_count
FROM students
GROUP BY inter_dom;--Filter for null values and values that are not International or Domestic
SELECT *
FROM students
WHERE inter_dom IS NULL;Region of the international students
SELECT region, COUNT(inter_dom) AS interdom_count
FROM students
WHERE inter_dom = 'Inter'
GROUP BY region;Find summary statistics for each diagnostic test for international students
SELECT
MIN(todep) AS min_phq,
MAX(todep) AS max_phq,
ROUND(AVG(todep),2) AS avg_phq,
MIN(tosc) AS min_scs,
MAX(tosc) AS max_scs,
ROUND(AVG(tosc), 2) AS avg_scs,
MIN(toas) AS min_as,
MAX(toas) AS max_as,
ROUND(AVG(toas), 2) AS avg_as
FROM students
WHERE inter_dom IN ('Inter')
GROUP BY inter_dom;Number of international students and thier average score by length of stay
-- Find the number of international students and their average scores by length of stay, in descending order of length of stay
SELECT stay,
COUNT(*) AS count_int,
ROUND(AVG(todep), 2) AS average_phq,
ROUND(AVG(tosc), 2) AS average_scs,
ROUND(AVG(toas), 2) AS average_as,
FROM students
WHERE inter_dom = 'Inter'
GROUP BY stay
ORDER BY stay DESC;