Tag: Prevalence

What was the National Survey of Mental Health and Wellbeing?

Published on by Andrew MarshallLeave a comment

Introduction

The 2007 National Survey of Mental Health and Wellbeing (NSMHWB) was designed to provide lifetime prevalence estimates for mental disorders.

Purpose

To gain statistics on key mental health issues including the prevalence of mental disorders, the associated disability, and the use of services.

As such the NSMHWB was a national epidemiological survey of mental disorders that used similar methodology to the NCS. It aimed to answer three main questions:

  1. How many people meet DSM-IV and ICD-10 diagnostic criteria for the major mental disorders?
  2. How disabled are they by their mental disorders? and
  3. How many have seen a health professional for their mental disorder?

Background

Respondents were asked about experiences throughout their lifetime. In this survey, 12-month diagnoses were derived based on lifetime diagnosis and the presence of symptoms of that disorder in the 12 months prior to the survey interview. Assessment of mental disorders presented in this publication are based on the definitions and criteria of the World Health Organisation’s (WHO) International Classification of Diseases, Tenth Revision (ICD-10). Prevalence rates are presented with hierarchy rules applied (i.e. a person will not meet the criteria for particular disorders because the symptoms are believed to be accounted for by the presence of another disorder).

Results

  • Among the 16,015,300 people aged 16-85 years, 45% (or 7,286,600 people) had a lifetime mental disorder (i.e. a mental disorder at some point in their life).
  • More than half (55% or 8,728,700 people) of people had no lifetime mental disorders.
  • Of people who had a lifetime mental disorder:
    • 20% (or 3,197,800 people) had a 12-month mental disorder and had symptoms in the 12 months prior to the survey interview; and
    • 25% (or 4,088,800 people) had experienced a lifetime mental disorder but did not have symptoms in the 12 months prior to the survey interview.

Prevalence of 12-Month Mental Health Disorders

Prevalence of mental disorders is the proportion of people in a given population who met the criteria for diagnosis of a mental disorder at a point in time

  • Among the 3,197,800 people (or 20% of people) who had a 12-month mental disorder and had symptoms in the 12 months prior to interview:
    • 14.4% had a 12-month Anxiety disorder (includes Panic disorder (2.6%); Agoraphobia (2.8%); Social Phobia (4.7%); Generalised Anxiety Disorder (2.7%); Obsessive-Compulsive Disorder (1.9%); and Post-Traumatic Stress Disorder (6.4%))
    • 6.2% had a 12-month Affective disorder (includes Depressive Episode (4.1%) (includes severe, moderate and mild depressive episodes); Dysthymia (1.3%); and Bipolar Affective Disorder (1.8%)), and
    • 5.1% had a 12-month Substance Use Disorder (includes Alcohol Harmful Use (2.9%); Alcohol Dependence (1.4%); and Drug Use Disorders (includes harmful use and dependence) (1.4%)).
  • Note that a person may have had more than one mental disorder.
    • The components when added may therefore not add to the total shown.
    • Includes Severe Depressive Episode, Moderate Depressive Episode, and Mild Depressive Episode.
    • Includes Harmful Use and Dependence.

There were 3.2 million people who had a 12-month mental disorder. In total, 14.4% (2.3 million) of Australians aged 16-85 years had a 12-month Anxiety disorder, 6.2% (995,900) had a 12-month Affective disorder and 5.1% (819,800) had a 12-month Substance Use disorder.

Women experienced higher rates of 12-month mental disorders than men (22% compared with 18%). Women experienced higher rates than men of Anxiety (18% and 11% respectively) and Affective disorders (7.1% and 5.3% respectively). However, men had twice the rate of Substance Use disorders (7.0% compared with 3.3% for women).

The prevalence of 12-month mental disorders varies across age groups, with people in younger age groups experiencing higher rates of disorder. More than a quarter (26%) of people aged 16-24 years and a similar proportion (25%) of people aged 25-34 years had a 12-month mental disorder compared with 5.9% of those aged 75-85 years old.

You can read the full survey results here and a shorter analysis can be found here.

What is the Association of Urbanicity with Schizophrenia & Related Mortality in China?

Published on by Andrew MarshallLeave a comment

Research Paper Title

Association of Urbanicity with Schizophrenia and Related Mortality in China: Association de l’urbanicité avec la schizophrénie et la mortalité qui y est reliée en Chine.

Background

Although higher prevalence of schizophrenia in Chinese urban areas was observed, studies focused on the association between schizophrenia and urbanicity were less in China. Using a national representative population-based data set, this study aimed to investigate the relationship between urbanicity and schizophrenia and its related mortality among adults aged 18 years old and above in China.

Methods

Data were obtained from the Second China National Sample Survey on Disability in 2006 and follow-up studies from 2007 to 2010 each year. We restricted our analysis to 1,909,205 participants aged 18 years or older and the 2,071 schizophrenia patients with information of survival and all-caused mortality of the follow-up surveys from 2007 to 2010.

Schizophrenia was ascertained according to the International Statistical Classification of Diseases, 10th Revision. The degree of urbanicity and the region of residence were used to be the proxies of urbanicity. Of these, the degree of urbanicity measured by the ratio of non-agricultural population to total population and the region of residence measured by six categorical variables (first-tier cities, first-tier city suburbs, second-tier cities, second-tier city suburbs, other city areas, and rural areas).

Logistics regression models and restricted polynomial splines were used to examine the linear/nonlinear relationship between urbanicity and the risk of schizophrenia. Cox proportional hazards regression models were used to test the role of urbanicity on mortality risk of schizophrenia patients.

Results

10% increase in the degree of urbanicity was associated with increased risk of schizophrenia (OR = 1.44; 95% CI, 1.32 to 1.57). The nonlinear model further confirmed the association between the degree of urbanicity and the risk of schizophrenia. This association existed sex difference, as the level of urbanicity increased, schizophrenia risk of males grew faster than the risk of females. The hazard ratio (HR) of mortality in schizophrenia patients decreased with the elevated of urbanicity level, with a HR of 0.42 (95% CI, 0.21 to 0.84).

Conclusions

This research suggested that incremental changes in the degree of urbanicity linked to higher risk of schizophrenia, and as the degree of urbanicity elevated, the risk of schizophrenia increased more for men than for women. Additionally, the researchers found that schizophrenia patients in higher degree of urbanicity areas had lower risk of mortality.

These findings contributed to the literature on schizophrenia in developing nations under a non-Western context and indicates that strategies to improve mental health conditions are needed in the progress of urbanicity.

Reference

Luo, Y., Pang, L., Guo, C., Zhang, L. & Zheng, X. (2020) Association of Urbanicity with Schizophrenia and Related Mortality in China: Association de l’urbanicité avec la schizophrénie et la mortalité qui y est reliée en Chine. Canadian Journal of Psychiatry. doi: 10.1177/0706743720954059. Online ahead of print.