Table 2.

Mean and Interquartile Range (IQR) of Age of Onset Distribution of Psychotic Experiences (PEs) by Annualized PE Frequency Metric (n = 2385)

Tertiles of Frequency of PE per Yeara	n b	Meanc	SE	Median (IQR)	F Testd	P-value
Lowest tertile (≤0.1 episodes per year)	786	21.6	0.8	18 (10–28)	8.0	<.001
Middle tertile (0.1 to 0.8 episodes per year)	763	25.5	1.1	21 (14–34)
Highest tertile (>0.8 episodes per year)	836	26.1	0.8	22 (15–35)

Note: ^aAnnualized PE (Frequency of PE per year) = Frequency of PE/ (age at interview − age of onset + 1).

^bUnweighted number of respondents.

^cEstimates were based on weighted data.

^dBivariate linear regression to test for significant differences in means of age of onset, adjusted for country. Overall F test = 8.0, P < .001. Pairwise comparison between the lowest and middle tertile (F = 2.9, P = .004); between the lowest and highest tertile (F = 3.8, P < .001); between the middle and highest tertile (F = 0.0, P = .99). Significant level for all pairwise comparisons is being set at the .01 level.