Table 3.

Characteristics of four groups of youth derived from cluster analysis of subject responses on mPRIME-Screen (N=908).

Features	Normative	High Symptom	Intermediate Symptom	Grandiose Symptom	F/χ2	p
Number (%)	500 (55.0)	101 (11.1)	169 (18.6)	138 (15.2)	-	-
Age	18.7 (3.4)	20.4 (3.3)	18.8 (3.4)	18.1 (3.5)	9.0	<0.0001
Gender – N (%)					4.7	0.2
Female	177 (35.4)	36 (35.6)	75 (44.4)	49 (35.5)
Male	323 (64.6)	65 (64.4)	94 (55.6)	89 (64.5)
mPRIME-Screen Items:
1.   Odd things	0.3 (1.8)	3.2 (1.8)	1.6 (1.9)	1.3 (1.8)	147.6	<0.0001
2.   Predict Future	0.4 (0.9)	2.7 (2.1)	1.1 (1.6)	1.9 (2.1)	91.5	<0.0001
3.   Controlled Thoughts	0.3 (0.6)	3.6 (1.5)	2.4 (1.7)	1.4 (1.8)	272.1	<0.0001
4.   Superstitions	0.3 (0.8)	3.1 (1.9)	1.3 (1.8)	1.3 (1.8)	126.0	<0.0001
5.   Real vs. Imaginary	0.4 (0.9)	4.0 (1.4)	1.5 (1.8)	1.2 (1.6)	228.8	<0.0001
6.   Mind Reading	0.4 (0.9)	3.8 (1.7)	1.6 (1.6)	1.9 (2.0)	193.2	<0.0001
7.   Hurt Me	0.3 (0.6)	3.0 (2.0)	2.2 (1.8)	0.7 (1.3)	197.2	<0.0001
8.   Supernatural	0.3 (0.7)	3.8 (1.7)	0.4 (0.9)	4.3 (0.9)	1057.8	<0.0001
9.   Last 12 Months	0.2 (0.5)	1.2 (1.8)	0.7 (1.4)	0.5 (1.3)	32.0	<0.0001
10. Hear Sounds	0.2 (0.7)	1.6 (2.0)	1.1 (1.6)	0.8 (1.5)	48.4	<0.0001
11. Thoughts Loud	0.2 (0.5)	2.3 (2.1)	1.0 (1.5)	0.7 (1.6)	97.5	<0.0001
12. Going “Mad”	0.1 (0.3)	0.9 (1.6)	0.2 (0.8)	0.2 (0.7)	34.5	<0.0001

Values are given in means (SD) unless stated otherwise.

Chi square analysis was used to compare frequencies. ANOVA was used to compare means.

k-means cluster analysis was used to generate clusters. mPRIME item scores are derived from answer on a 0–5 severity scale, with a score of 0 being “Definitely Disagree”, and 5 being “Definitely Agree”. (Individuals that answered, “don’t know” on any item or did not indicate gender were not included in cluster analysis).