IQ trajectory, cognitive reserve, and clinical outcome following a first episode of psychosis: a 3-year longitudinal study.

The groups differed significantly in length of index admission (χ 2 = 6.05, P = .049), and pairwise comparisons showed that the low IQ and DIQ groups did not differ (χ 2 = 0.803, P = .370), but the patients in the preserved IQ group had shorter admissions compared with the low IQ group (χ 2 = 5.43, P = .020) and DIQ group (χ 2 = 3.27, P = .071) at a trend level of significance.

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