TABLE 1.
Factor structure of the SIAS and SPS found in previous studies.
| Study (Country) | Sample (n) | Number of factors | Item number |
| SIAS | |||
| Mattick and Clarke (1998) (Australia) | Clinical (243); Student (482) | 1 | 1–19 |
| Olivares et al. (2001) (Spain) | Students (654) | 1 | 1–20 |
| Ye et al. (2007) (China) | Students (1319) | 1 | 1–19 |
| Rodebaugh et al. (2006) (United States) | Students (445) | 1 | 1–17 |
| SPS | |||
| Mattick and Clarke (1998) (Australia) | Clinical (243); Student (482) | 3 | (1)2–6, 8, 13, 15–17, 20; (2)1, 7, 10–11, 18–19;(3)9, 12, 14 |
| Olivares et al. (2001) (Spain) | Student (654) | 1 | 1–20 |
| Ye et al. (2007) (China) | Student (1319) | 1 | 1–20 |
| SIAS and SPS joint structure | |||
| Safren et al. (1998) (United States) | Clinical (167) | 3 | SPS: (1)1, 2, 4, 8–13, 16–17; (2)3, 5, 7, 18–19;SIAS: 2–4, 5–7, 9–11, 13–20 |
| Osman et al. (1998) (United States) | Student (200) | 2 | SPS:1–20; SIAS: 1–20 |
| Sakurai et al. (2005) (Japan) | Clinical (149) | 3 | SPS:1–20; SIAS:(l)1–3, 6, 12–15, 17–19; (2)4, 5, 7–11, 16–20 |
| Carleton et al. (2009) (Canada) | Clinical (355) | 3 | SPS: (l)4, 6, 8, 13, 16, 17; (2)12, 14, 15;SIAS: 6, 9, 14, 15, 18 |
| Heidenreich et al. (2011) (Germany) | Clinical (577) | 2 | SPS: 1–20; SIAS: 1–20 |
| Kupper and Denollet (2012) (Netherlands) | Adults (1598) | 2 | SPS: 4–7, 12, 14–16, 18–20; SIAS:2, 6, 7, 9, 11, 14–18 |
| Peters et al. (2012) (Australia) | Clinical (902); Students (164) | 2 | SPS: 4, 7–8, 15–17; SIAS:2, 4, 6, 8, 10, 13 |
| Fergus et al. (2012) United States) | Non-clinical (469); Clinical (145) | 2 | SPS, 4, 5, 811, 18, 19; SIAS: 3, 6, 8, 16, 18, 19 |
| De Beurs et al. (2014) (Holland) | Clinical (357) | 4 | SPS:(l)2, 4, 8, 11, 16, 17; (2)3, 5–6, 12–13, 15, 18, 20;(3)1, 7, 9–10, 14 |
| Wong et al. (2019) (Australia) | Clinical (496) | 2 | SPS: 1–2 0; S- SIAS: 1–17 |