. Author manuscript; available in PMC: 2023 Apr 26.

Published in final edited form as: Schizophr Res. 2022 Sep 22;248:309–319. doi: 10.1016/j.schres.2022.09.005

Table 3.

Commonly endorsed item association with the SIPS.

Item	Corresponding SIPS Symptom Domain	SIPS+ / PQ+	SIPS− / PQ+	Chi-square test	Sensitivity	Specificity	Positive Predictive Value
Item	Corresponding SIPS Symptom Domain	SIPS+ / PQ−	SIPS− / PQ−	Chi-square test	Sensitivity	Specificity	Positive Predictive Value
3. I have had difficulty organizing my thoughts or finding the right words.	Disorganized communication	7	127	X²(1, N = 162) =0.53, p = 0.47	100	18.06	5.22
	Disorganized communication	0	28	X²(1, N = 162) =0.53, p = 0.47	100	18.06	5.22
2. The passage of time has felt unnaturally faster or slower than usual.	Unusual thought content / Delusional ideas	22	96	X²(1,N = 162) = 5.77, p = 0.02	95.65	30.94	18.64
	Unusual thought content / Delusional ideas	1	43	X²(1,N = 162) = 5.77, p = 0.02	95.65	30.94	18.64
37. I have had trouble focusing on one thought at a time.	Disorganized communication	5	115	X²(1,N = 162) < 0.001, p = 1	71.43	25.81	4.17
37. I have had trouble focusing on one thought at a time.	Disorganized communication	2	40	X²(1,N = 162) < 0.001, p = 1	71.43	25.81	4.17
23. I have wandered off the topic or rambled on too much when I was speaking.	Disorganized communication	6	103	X²(1,N = 162) =0.42, p = 0.52	85.71	33.55	5.5
	Disorganized communication	1	52	X²(1,N = 162) =0.42, p = 0.52	85.71	33.55	5.5
8. I seemed to live through events exactly as they happened before (déjà vu).	Unusual thought content / Delusional ideas	18	92	X²(1,N = 162) =0.82, p = 0.36	78.26	33.81	16.36
	Unusual thought content / Delusional ideas	5	47	X²(1,N = 162) =0.82, p = 0.36	78.26	33.81	16.36
38. I have felt that other people were watching me or talking about me.	Suspiciousness/ Persecutory ideas	20	74	X²(1,N = 162) = 3.66, p = 0.06	76.92	45.59	21.28
	Suspiciousness/ Persecutory ideas	6	62	X²(1,N = 162) = 3.66, p = 0.06	76.92	45.59	21.28
49. My thinking has felt confused, muddled, or disturbed in some way.	Disorganized communication	5	98	X²(1,N = 162) = 0.002, p = 0.97	71.43	36.77	4.85
	Disorganized communication	2	57	X²(1,N = 162) = 0.002, p = 0.97	71.43	36.77	4.85
77. I have been concerned that my closest friends and co-workers were not really loyal or trustworthy.	Suspiciousness/ Persecutory ideas	17	69	X²(1,N = 162) = 1.34, p = 0.25	65.38	49.26	19.77
	Suspiciousness/ Persecutory ideas	9	67	X²(1,N = 162) = 1.34, p = 0.25	65.38	49.26	19.77
55. I have been worried that something may be wrong with my mind.	Disorganized communication	5	85	X²(1,N = 162) = 0.23, p = 0.63	71.43	45.16	5.56
	Disorganized communication	2	70	X²(1,N = 162) = 0.23, p = 0.63	71.43	45.16	5.56
35. I have had superstitious thoughts.	Unusual thought content / Delusional ideas	9	45	X²(1,N = 162) = 0.16, p = 0.69	39.13	67.63	16.67
35. I have had superstitious thoughts.	Unusual thought content / Delusional ideas	14	94	X²(1,N = 162) = 0.16, p = 0.69	39.13	67.63	16.67
90. People have found it hard to understand what I say.	Disorganized communication	3	61	X²(1,N = 162) < 0.001, p = 1	42.86	60.65	4.69
90. People have found it hard to understand what I say.	Disorganized communication	4	94	X²(1,N = 162) < 0.001, p = 1	42.86	60.65	4.69
60. I have experienced unusual bodily sensations such as tingling, pulling, pressure, aches, burning, cold, numbness, shooting pains, vibrations or electricity.	Perceptual abnormalities / Hallucinations	8	49	X²(1,N = 162) = 2.27, p = 0.13	57.14	66.89	14.04
	Perceptual abnormalities / Hallucinations	6	99	X²(1,N = 162) = 2.27, p = 0.13	57.14	66.89	14.04
30. I have thought that I am very important or have abilities that are out of the ordinary.	Grandiose ideas	5	52	X²(1,N = 162) = 4.33, p = 0.04	83.33	66.67	8.77
	Grandiose ideas	1	104	X²(1,N = 162) = 4.33, p = 0.04	83.33	66.67	8.77
9. I have smelled or tasted things that other people didn't notice.	Perceptual abnormalities / Hallucinations	10	41	X²(1,N = 162) = 9.40, p = 0.002	71.43	72.30	19.61
	Perceptual abnormalities / Hallucinations	4	107	X²(1,N = 162) = 9.40, p = 0.002	71.43	72.30	19.61
61. I have thought about beliefs that other people would find unusual or bizarre.	Unusual thought content / Delusional ideas	13	53	X²(1,N = 162) = 2.06, p = 0.15	56.52	61.87	19.70
	Unusual thought content / Delusional ideas	10	86	X²(1,N = 162) = 2.06, p = 0.15	56.52	61.87	19.70

Note: Chi-squares testing relationship between the proportion of PQ item endorsement and a clinically relevant rating of 3 or above on the corresponding SIPS positive symptom.