Abstract
Hare and Price1 stated that in studies of birth order, schizophrenics should be compared with a control group because of anticipated birth-rate biases attributable to change in birth rate and family size. But their control group was limited to psychiatric patients with diagnoses other than schizophrenia. Such a sample may be expected to differ from the normal population in various respects, including birth order.
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BARRY, H., BARRY, H. Birth Order of Psychiatric Patients. Nature 231, 57 (1971). https://doi.org/10.1038/231057a0
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DOI: https://doi.org/10.1038/231057a0
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