Table 2.
Prevalence of Endorsed Items From CIDI Regarding Psychotic-Like Experiences Among 2793 Young Adult Norwegian Twins
| Item | Item Content | Thresholda | n | % |
|---|---|---|---|---|
| G0 | Have you ever had any of the experiences on this list (22 screening items) | 1 | 708 | 25.4 |
| G1 | Have you ever believed people were spying on you? | 1 | 38 | 1.4 |
| 2 | 24 | 0.9 | ||
| G2 | Was there ever a time when you believed people were following you? | 1 | 87 | 3.1 |
| 2 | 36 | 1.3 | ||
| G2B | Have you been convinced that people you saw talking to each other were talking about you or laughing at you? | 12 | 25662 | 9.22.2 |
| G3 | Have you ever believed that you were being secretly tested or experimented on? | 1 | 6 | 0.2 |
| 2 | 3 | 0.1 | ||
| G4 | Have you ever believed that someone was plotting against you or trying to hurt you or poison you? | 12 | 117 | 0.40.3 |
| G5 | Have you ever been convinced that someone you had not met was in love with you? | 1 | 5 | 0.2 |
| G6 | Have you ever been unreasonably convinced that your spouse or partner was being unfaithful, although he/she told you that was not true? | 1 | 14 | 0.5 |
| G7 | Have you ever believed that someone was reading your mind? | 12 | 2513 | 0.90.5 |
| G8 | Have you ever been convinced you could actually hear what another person was thinking, even though he or she was not speaking? | 1 | 17 | 0.6 |
| G9 | Have you ever been convinced that others could hear your thoughts? | 1 | 19 | 0.7 |
| G10 | Have you ever been convinced that you were under the control of some power or force, so that your actions and thoughts were not your own? | 12 | 129 | 0.40.3 |
| G11 | Have you ever been convinced that strange thoughts, or thoughts that were not your own, were being put directly into your mind? | 1 | 12 | 0.4 |
| G12 | Have you ever been convinced that someone or something could take or steal your thoughts out of your mind? | 1 | 2 | 0.1 |
| G13 | Have you ever been convinced that you were being sent special messages through television or the radio, or that a program had been arranged just for you alone? | 1 | 6 | 0.2 |
| G13B | Have you felt that a book, or newspaper, or song was meant only for you and no one else? | 1 | 7 | 0.3 |
| 2 | 8 | 0.3 | ||
| G14 | Have you ever felt strange forces working on you, as if you were being hypnotized or magic was being performed on you, or you were being hit by x-rays or laser beams? | 1 | 8 | 0.3 |
| G15 | Other volunteered delusions | 1 | 29 | 1.0 |
| G17 | Have you ever seen something or someone that others who were present could not see - that is, had a vision\hallucination when you were completely awake? | 1 | 39 | 1.4 |
| G18 | Have you more than once heard things other people couldn’t hear, for example sounds or something like a voice? | 12 | 2118 | 0.80.6 |
| G19 | Did you ever hear voices others could not hear? | 1 | 18 | 0.6 |
| 2 | 3 | 0.1 | ||
| G20 | Have you ever been bothered by strange smells that nobody else seemed to be able to smell, perhaps even unusual odours coming from your own body? | 1 | 19 | 0.7 |
| G20C | Have you ever had strange tastes in your mouth that could not be explained by anything you had eaten or put in your mouth? | 12 | 112 | 0.40.1 |
| G21 | Have you ever had unusual feelings on your skin or inside your body - like being touched when nothing was there or feeling something moving inside your body? | 1 | 31 | 1.1 |
| G22 | Have you ever had a time when you were unable to move at all when it wasn’t due to a physical or other medical reason? | 12 | 279 | 1.00.3 |
| G22A | Have you ever had a time when you moved constantly and couldn’t stop when it wasn’t due to a physical or other medical reason? | 12 | 73 | 0.30.1 |
Note: aThreshold 1 reflects that the individual has the symptom, and threshold 2 reflects that the symptom has definite psychotic or bizarre content.