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Table 1 Internal validity (alpha) of subscale scores of the Scale of Public Attitudes about Suicide (SPAS) among psychiatrists in Shanghai and comparison of attitudes about suicide between psychiatrists in Shanghai and urban community members with and without adjustment for gender, age and years of education

From: Cross-sectional study of attitudes about suicide among psychiatrists in Shanghai

SPAS subscales Number of items Alpha Normality Comparison of mean (sd) subscale scores without adjustment Comparison adjusted for age, gender and years of education using linear regression models
    Kolmogorov -Smirnov Za p Psychiatrists [n = 179] mean (sd) Community membersb[n = 548] mean (sd) t-test p β Beta 95% CI of β p
Subscale 1 c 6 0.586 1.28 0.075 69.2 (15.4) 47.0 (21.5) 15.05 <0.001 31.2 0.60 27.1 ~ 35.4 <0.001
Subscale 2 c 5 0.619 1.32 0.063 63.7 (16.1) 51.0 (22.0) 8.31 <0.001 14.6 0.29 10.2 ~ 19.1 <0.001
Subscale 3 c 10 0.762 0.97 0.308 45.3 (14.5) 33.4 (21.2) 8.43 <0.001 5.6 0.12 1.5 ~ 9.7 0.007
Subscale 4 c 7 0.715 1.03 0.242 41.0 (16.9) 60.9 (20.8) −12.92 <0.001 −17.8 −0.35 −22.1 ~ −13.5 <0.001
Subscale 5 c 6 0.622 1.13 0.154 42.8 (15.8) 52.1 (20.6) −6.26 <0.001 −12.9 −0.28 −17.0 ~ −8.7 <0.001
Subscale 6 c 5 0.678 1.12 0.163 71.0 (16.0) 38.4 (19.5) 22.35 <0.001 29.6 0.54 25.6 ~ 33.5 <0.001
Subscale 7 c 5 0.814 1.01 0.265 57.0 (21.5) 62.6 (22.9) −2.88 0.004 −6.1 −0.12 −10.9 ~ −1.3 0.013
  1. aThe Kolmogorov-Smirnov test is an overall assessment of normality (including consideration of kurtosis and skewedness); if the p-value is >0.05 the distribution is considered normal.
  2. bResults provided in 2011 study by Li and colleagues.
  3. cAdjusted total scores for all seven attitudinal subscales have a range of 0–100.
  4. Subscale 1: Respondent believes suicide can be prevented.
  5. Subscale 2: Respondent believes individuals are able to control their own suicidal tendencies.
  6. Subscale 3: Respondent holds stigmatizing attitudes about suicide.
  7. Subscale 4: Respondent is understanding of and feels empathy for persons with suicidal behavior.
  8. Subscale 5: Respondent believes suicidal behavior is an effective method of controlling others.
  9. Subscale 6: Respondent believes that suicide is an important social problem.
  10. Subscale 7: Respondent believes that suicides and suicide attempts are essentially different.