Q2. What are the effects of short sleep?
Short sleep may also lead to a number of adverse physiological changes (e.g., impaired glucose tolerance, inflammation), which increase the risks of chronic conditions such as diabetes, obesity and hypertension [32], [33] and [34].
Q3. What were the three responses to the Kessler Psychological Distress Scale?
Participants’ scores on this scale were coded as low emotional disturbances (<16), moderate emotional disturbances (16–21) and high/very high emotional disturbances (22–50) [31].
Q4. What were the other variables that were included in the analyses?
Additional demographic variables such as sex, place of residence, country of birth, education level, and marital status were also measured and included in the analyses.
Q5. What were the participants’ responses to the Kessler Psychological Distress Scale?
Body mass index (BMI) was determined from self-reported height and weight; participants were categorised as lean (BMI: 18.5–24.9), overweight (BMI: 25.0–29.9) or obese (BMI: ≥ 30).
Q6. What were the responses to the Kessler Psychological Distress Scale?
In the adjusted analyses, sleep duration was entered alongside socio-demographic factors (age, sex, country of birth, education level, marital status, work hours, place of residence), health-related behaviours (alcohol consumption and smoking status), chronic health conditions (obesity, cancer, heart disease, diabetes and stroke) and emotional disturbances (as assessed by the Kessler Psychological Distress Scale).
Q7. What is the relationship between sleep duration and SRH in the adjusted and unadjust?
Short sleep could contribute to poor SRH and QOL by impairing mood and cognitive functioning or because of an increase in fatigue.
Q8. What is the significance of self-rated health status?
Self-rated health status as a health measure: the predictive value of self-reported health status on the use of physician services and on mortality in the working-age population.
Q9. How was the association between sleep duration and SRH in the unadjusted?
Short and long sleep were associated with poorer SRH in the 75–84 year age group in the unadjusted analyses, but only long sleep significantly predicted poor SRH in the adjusted analyses.
Q10. What was the largest study conducted on a sample of 17465 university students?
The largest of these studies was conducted on a sample of 17,465 university students from 24 countries, where short sleep (but not long sleep) was found to be associated with poor SRH [21].
Q11. What was the preferred method for analyzing SRH?
This was preferred over binary logistic regression as more detailed information regarding categorical covariates can be obtained without dummy coding.