Describe and explain: Rates of Schiz diagnosis is considerably different depending on what country you're in. shows what may be considered as Schiz on one country may in fact be different to another country, even when they are using the same classification tool.
Example: Copeland (1971)- 134 US and 194 British psychiatrists given a description of a patient. 69% of the US pshchiatrists and 2% of the British psychiatrists gave the diagnosis of Schiz.
Effects on reliability and/or validity and why: It makes the diagnosis tools fairly unreliable as the difference is huge. This also affects validity as the psychiatrists may be culturally bias, and therefore misdiagnose, which means the patient recieves incorrect treatment.
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