Pending enough primary studies, we invite reviews on this topic to be conducted. Alternatively we will endeavour to conduct our own review to fill this gap in the Library.

April 2022

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Pending enough primary studies, we invite reviews on this topic to be conducted. Alternatively we will endeavour to conduct our own review to fill this gap in the Library.

April 2022

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Incidence refers to how many new cases of schizophrenia there are per population in a specified time period. It is different from prevalence, which refers to how many existing cases there are at a particular point in time, or over a lifetime. Incidence is usually reported as the number of new cases per 100,000 people per year, but this can vary. Differences in the incidence of a disorder can provide clues to its possible causes. For example, a population register with information gained from consensus data helps to identify all adults in a defined area who were born within a certain time period (a cohort). Cross linking this information with a mental health register for the cohort can be used to identify people who received treatment for schizophrenia over particular times. This information provides the incidence of schizophrenia for various age groups within that cohort.

What is the evidence for variation in incidence according to ethnicity?

Moderate to high quality evidence suggests the incidence of psychotic disorders in ethnic minority groups in the UK and the Netherlands is higher than in the majority population in those areas (large effect). This effect is largest in areas with low ethnic density compared to areas with high ethnic density.

April 2022

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Pending enough primary studies, we invite reviews on this topic to be conducted. Alternatively we will endeavour to conduct our own review to fill this gap in the Library.

April 2022

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Pending enough primary studies, we invite reviews on this topic to be conducted. Alternatively we will endeavour to conduct our own review to fill this gap in the Library.

April 2022

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Pending enough primary studies, we invite reviews on this topic to be conducted. Alternatively we will endeavour to conduct our own review to fill this gap in the Library.

April 2022

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Incidence refers to how many new cases of schizophrenia there are per population in a specified time period. It is different from prevalence, which refers to how many existing cases there are at a particular point in time, or over a lifetime. Incidence is usually reported as the number of new cases per 100,000 people per year, but this can vary. Differences in the incidence of a disorder can provide clues to its possible causes. For example, a population register with information gained from consensus data helps to identify all adults in a defined area who were born within a certain time period (a cohort). Cross linking this information with a mental health register for the cohort can be used to identify people who received treatment for schizophrenia over particular times. This information provides the incidence of schizophrenia for various age groups within that cohort.

What is the evidence for differences in incidence rates according to sex?

Overall, moderate to high quality evidence finds the incidence of schizophrenia is higher in males than in females. However, this is only apparent in males up until around 40 years of age, then incidence is similar between males and females until about 50 years, then it is higher in females than males over 50 years of age. This is proposed to be due to decreasing oestrogen levels in females over time, as oestrogen is a proposed protective factor for schizophrenia.

April 2022

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Incidence refers to how many new cases of schizophrenia there are per population in a specified time period. It is different from prevalence, which refers to how many existing cases there are at a particular point in time, or over a lifetime. Incidence is usually reported as the number of new cases per 100,000 people per year, but this can vary. Differences in the incidence of a disorder can provide clues to its possible causes. For example, a population register with information gained from consensus data helps to identify all adults in a defined area who were born within a certain time period (a cohort). Cross linking this information with a mental health register for the cohort can be used to identify people who received treatment for schizophrenia over particular times. This information provides the incidence of schizophrenia for various age groups within that cohort.

The term “migrant” usually refers to first generation migrants – people with a foreign birth place, however some studies also include locally born offspring, or second generation migrants in their analyses. Any association observed between migrant status and increased incidence of schizophrenia has stimulated a great deal of research and explanatory hypotheses, including additional stress relating to migration and settling into a new country, and possible issues with discrimination. Other explanations include a tendency for at-risk individuals to migrate, and underlying genetic variances across cultures.

What is the evidence on incidence of schizophrenia in migrant populations?

Moderate to high quality evidence finds the incidence rate of schizophrenia is higher in migrants than in native-born populations. This is found in both first and second generation migrants, and particularly in migrants with black skin and in those living in the UK, The Netherlands, and Scandinavian countries.

Please also see the topic on incidence of schizophrenia in refugees.

April 2022

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Incidence refers to how many new cases there are per population in a specified time period. It is different from prevalence, which refers to how many existing cases there are at a particular point in time. Incidence is usually reported as the number of new cases per 100,000 people per year. Alternatively some studies present the number of new cases that have accumulated over several years against a person-years denominator. This denominator is the sum of individual units of time that the persons in the population are at risk of developing schizophrenia. It takes into account the size of the underlying population sample and its age structure over the duration of observation. Differences in the incidence of a disorder can provide clues to its possible causes. For example, a population register with information gained from consensus data helps to identify all adults who were born within a certain time period (an age cohort) and where they were born. Cross linking this information with a mental health register can be used to identify those who received treatment for schizophrenia over particular times. This can provide information regarding the incidence of schizophrenia within different groups.

What is the evidence for incidence of schizophrenia in refugees?

Moderate quality evidence finds small to medium-sized effects of increased incidence of schizophrenia and other psychotic disorders in refugee groups after migration (up to 10 years) compared to native-born populations and non-refugee immigrants. The incidence was highest in refugee men and in refugees from the Middle East.

April 2022

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The post Incidence in refugees appeared first on NeuRA Library.

Incidence refers to how many new cases of schizophrenia there are per population in a specified time period. It is different from prevalence, which refers to how many existing cases there are at a particular point in time, or over a lifetime. Incidence is usually reported as the number of new cases per 100,000 people per year, but this can vary. Differences in the incidence of a disorder can provide clues to its possible causes. For example, a population register with information gained from consensus data helps to identify all adults in a defined area who were born within a certain time period (a cohort). Cross linking this information with a mental health register for the cohort can be used to identify people who received treatment for schizophrenia over particular times. This information provides the incidence of schizophrenia for various age groups within that cohort.

What is the evidence for spatial variation in incidence rates?

Moderate quality evidence finds the incidence of schizophrenia or schizophreniform disorder is higher in urban regions than in rural areas or mixed urban/rural areas. Incidence rates were higher for males than females who were born at high latitudes. Moderate to low quality evidence finds no association between the level of a country’s per capita gross national product or mean income and incidence rates of schizophrenia.

April 2022

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