DSM Criteria

Autism

A. Persistent deficits in social communication and social interaction across multiple contexts, as manifested by the following, currently or by history

    Deficits in social-emotional reciprocity;
    Deficits in nonverbal communicative behaviours used for social interaction;
    Deficits in developing, maintaining and understanding relationships

B. Restricted, repetitive patterns of behaviour, interests or activities as manifested by at least two of the following, currently or by history:

    Stereotyped or repetitive motor movements, use of objects, or speech;
    Insistence on sameness, inflexible adherence to routines, or ritualised patterns of verbal or nonverbal behaviour;
    Highly restricted, fixated interests that are abnormal in intensity or focus;
    Hyper- or hypo- reactivity to sensory input or unusual interest in sensory aspects of the environment.

C. Symptoms must be present in the early developmental period (but may not become fully manifest until social demands exceed limited capacities, or may be masked by learned strategies in later life).

D. Symptoms cause clinically significant impairment in social, occupational or other important areas of current functioning.

E. These disturbances are not better explained by intellectual disability (intellectual developmental disorder), or global developmental delay.

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ADHD

Inattentive Type: Six or more symptoms of inattention for children up to age 16, or five or more for adolescents 17 and older and adults; symptoms of inattention have been present for at least 6 months, and they are inappropriate for developmental level:

    Often fails to give close attention to details or makes careless mistakes in schoolwork, at work, or with other activities.
    Often has trouble holding attention on tasks or play activities.
    Often does not seem to listen when spoken to directly.
    Often does not follow through on instructions and fails to finish schoolwork, chores, or duties in the workplace (e.g., loses focus, side-tracked).
    Often has trouble organizing tasks and activities.
    Often avoids, dislikes, or is reluctant to do tasks that require mental effort over a long period of time (such as schoolwork or homework).
    Often loses things necessary for tasks and activities (e.g. school materials, pencils, books, tools, wallets, keys, paperwork, eyeglasses, mobile telephones).
    Is often easily distracted
    Is often forgetful in daily activities.

Hyperactive-Impulsive Type: Six or more symptoms of hyperactivity-impulsivity for children up to age 16, or five or more for adolescents 17 and older and adults; symptoms of hyperactivity-impulsivity have been present for at least 6 months to an extent that is disruptive and inappropriate for the person’s developmental level:

    Often fidgets with or taps hands or feet, or squirms in seat.
    Often leaves seat in situations when remaining seated is expected.
    Often runs about or climbs in situations where it is not appropriate (adolescents or adults may be limited to feeling restless).
    Often unable to play or take part in leisure activities quietly.
    Is often "on the go" acting as if "driven by a motor".
    Often talks excessively.
    Often blurts out an answer before a question has been completed.
    Often has trouble waiting his/her turn.
    Often interrupts or intrudes on others (e.g., butts into conversations or games)

Additional conditions for both types

    Several inattentive or hyperactive-impulsive symptoms were present before age 12 years.
    Several symptoms are present in two or more setting, (such as at home, school or work; with friends or relatives; in other activities).
    There is clear evidence that the symptoms interfere with, or reduce the quality of, social, school, or work functioning.
    The symptoms are not better explained by another mental disorder (such as a mood disorder, anxiety disorder, dissociative disorder, or a personality disorder). The symptoms do not happen only during the course of schizophrenia or another psychotic disorder.

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Major Depressive Disorder

    Depressed mood or a loss of interest or pleasure in daily activities for more than two weeks.
    Mood represents a change from the person's baseline.
    Impaired function: social, occupational, educational.
    Specific symptoms, at least  5 of these 9, present nearly every day:

    Depressed mood or irritable most of the day, nearly every day, as indicated by either subjective report (e.g., feels sad or empty) or observation made by others (e.g., appears tearful).
    Decreased interest or pleasure in most activities, most of each day
    Significant weight change (5%) or change in appetite
    Change in sleep: Insomnia or hypersomnia
    Change in activity: Psychomotor agitation or retardation
    Fatigue or loss of energy
    Guilt/worthlessness: Feelings of worthlessness or excessive or inappropriate guilt
    Concentration: diminished ability to think or concentrate, or more indecisiveness
    Suicidality: Thoughts of death or suicide, or has suicide plan

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Generalized Anxiety Disorder

The presence of excessive anxiety and worry about a variety of topics, events, or activities. Worry occurs more often than not for at least 6 months and is clearly excessive.

The worry is experienced as very challenging to control.

The anxiety and worry is associated with at least 3 of the following physical or cognitive symptoms (In children, only 1 symptom is necessary for a diagnosis of GAD.):

    Edginess or restlessness.
    Tiring easily; more fatigued than usual.
    Impaired concentration or feeling as though the mind goes blank.
    Irritability (which may or may not be observable to others).
    Increased muscle aches or soreness.
    Difficulty sleeping (due to trouble falling asleep or staying asleep, restlessness at night, or unsatisfying sleep).

The anxiety, worry, or associated symptoms make it hard to carry out day-to-day activities and responsibilities. They may cause problems in relationships, at work, or in other important areas.

These symptoms are unrelated to any other medical conditions and cannot be explained by the effect of substances including a prescription medication, alcohol or recreational drugs.

These symptoms are not better explained by a different mental disorder.