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Figure 1. Prevalence rates of clinical depression as a function of four personality types. Note: **p < .01, ***p < .001. N = neuroticism, I = introversion. A, low N–low I versus low N-high I: 
2 = 0.52, df = 1, p = .469; low N-low or high I versus high N-low I: 2 = 4.14, df = 1, p = .042; low N-low or high I versus high N-high I: 2 = 17.72, df = 1, p < .001. B, low N-low I versus low N-high I: 2 = 0.16, df = 1, p = .685; low N-low or high I versus high N-low I: 2 = 1.64, df = 1, p = .200; low N-low or high I versus high N-high I: 2 = 14.50, df = 1, p < .001. C, low N-low I versus low N-high I: 2 = 0.65, df = 1, p = .418; low N-low or high I versus high N-low I: 2 = 8.69, df = 1, p = .003; low N-low or high I versus high N-high I: 2 = 24.81, df = 1, p < .001.
