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Corrigendum to “Reporting sensitivity and specificity for suicide risk instruments: A comment on Thorell et al. (2013)” [J Psychiat Res 54 (2014) 144–145]
Journal of Psychiatric Research 58 (2014) 200
Contents lists available at ScienceDirect
Journal of Psychiatric Research journal homepage: www.elsevier.com/locate/psychires
Corrigendum to “Reporting sensitivity and specificity for suicide risk instruments: A comment on Thorell et al. (2013)” [J Psychiat Res 54 (2014) 144e145] Christopher J. Mushquash a, b, *, Bruce Weaver b, Dwight Mazmanian a a b
Department of Psychology, Lakehead University, Thunder Bay, Ontario, Canada Northern Ontario School of Medicine, Thunder Bay, Ontario, Canada
The authors regret that in our comment on Thorell et al. (2013), Mushquash et al., (2014), the confidence intervals (CIs) for sensitivity, specificity, PVþ and PV were computed incorrectly. In each case, the sample size used in computing the Wilson score CI was the overall N for the 2 2 table rather than the appropriate row or column total. As a result, the CIs for those test properties were too narrow. We report here a revised version of our Table 2 (Table 2R) with corrected CIs for those test properties. The point estimates for all test properties and the CIs for overall accuracy were not affected by the error, and remain unchanged. The authors would like to apologise for any inconvenience caused. Table 2R Recalculated test properties. Table numbers refer to tables in the Thorell et al. article. Limits of the 95% confidence intervals (computed using the Wilson score method) are shown in parentheses. Table
Diagnostic group
Sn
Sp
PVþ
PV
3
Bipolar
0.75 (0.30 0.81 (0.63 1.00 (0.57 0.83 (0.68 0.95 (0.78 0.68 (0.57 0.82 (0.52 0.74 (0.66
0.20 (0.14 to 0.28) 0.33 (0.29 to 0.38) 0.43 (0.35 to 0.53) 0.33 (0.29 to 0.36) 0.23 (.16 to .32) 0.33 (.29 to .37) 0.44 (.35 to .53) 0.33 (.30 to .37)
0.03 (.01 to 0.06 (.04 to 0.07 (.03 to 0.06 (.04 to 0.21 (.14 to 0.16 (.13 to 0.13 (.07 to 0.17 (.14 to
0.96 (.80 to 0.97 (.94 to 1.00 (.93 to 0.98 (.95 to 0.96 (.80 to 0.84 (.78 to 0.96 (.86 to 0.88 (.83 to
Unipolar Other Grand total 4
Bipolar Unipolar Other Grand total
to 0.95) to 0.92) to 1.00) to 0.92) to 0.99) to 0.77) to 0.95) to 0.81)
.08) .09) .16) .08) .30) .20) .23) .20)
Acc .99) .99) 1.00) .99) .99) .89) .99) .91)
0.21 (.15 to 0.36 (.32 to 0.46 (.37 to 0.35 (.32 to 0.36 (.28 to 0.38 (.34 to 0.48 (.39 to 0.39 (.36 to
.29) .40) .55) .38) .44) .43) .56) .43)
Sn ¼ sensitivity; Sp ¼ specificity; PVþ ¼ predictive value of a positive test; PV ¼ predictive value of a negative test; Acc ¼ Accuracy.
References Mushquash C, Weaver B, Mazmanian D. Reporting sensitivity and specificity for suicide risk instruments: a comment on Thorell, et al. (2013). J Psychiatr Res 2014;54:144e5. DOI, http://dx.doi.org/10.1016/j.jpsychires.2014.03.014.
DOI of original article: http://dx.doi.org/10.1016/j.jpsychires.2014.03.014. * Corresponding author. Department of Psychology, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B5E1, Canada. E-mail address: [email protected] (C.J. Mushquash). http://dx.doi.org/10.1016/j.jpsychires.2014.07.010 0022-3956/© 2014 Elsevier Ltd. All rights reserved.
Thorell LH, Wolfersdorf M, Straub R, Steyer J, Hodgkinson S, Kaschka WP, et al. Electrodermal hyporeactivity as a trait marker for suicidal propensity in uniand bipolar depression. J Psychiatr Res 2013;47:1925e31.
Contents lists available at ScienceDirect
Journal of Psychiatric Research journal homepage: www.elsevier.com/locate/psychires
Corrigendum to “Reporting sensitivity and specificity for suicide risk instruments: A comment on Thorell et al. (2013)” [J Psychiat Res 54 (2014) 144e145] Christopher J. Mushquash a, b, *, Bruce Weaver b, Dwight Mazmanian a a b
Department of Psychology, Lakehead University, Thunder Bay, Ontario, Canada Northern Ontario School of Medicine, Thunder Bay, Ontario, Canada
The authors regret that in our comment on Thorell et al. (2013), Mushquash et al., (2014), the confidence intervals (CIs) for sensitivity, specificity, PVþ and PV were computed incorrectly. In each case, the sample size used in computing the Wilson score CI was the overall N for the 2 2 table rather than the appropriate row or column total. As a result, the CIs for those test properties were too narrow. We report here a revised version of our Table 2 (Table 2R) with corrected CIs for those test properties. The point estimates for all test properties and the CIs for overall accuracy were not affected by the error, and remain unchanged. The authors would like to apologise for any inconvenience caused. Table 2R Recalculated test properties. Table numbers refer to tables in the Thorell et al. article. Limits of the 95% confidence intervals (computed using the Wilson score method) are shown in parentheses. Table
Diagnostic group
Sn
Sp
PVþ
PV
3
Bipolar
0.75 (0.30 0.81 (0.63 1.00 (0.57 0.83 (0.68 0.95 (0.78 0.68 (0.57 0.82 (0.52 0.74 (0.66
0.20 (0.14 to 0.28) 0.33 (0.29 to 0.38) 0.43 (0.35 to 0.53) 0.33 (0.29 to 0.36) 0.23 (.16 to .32) 0.33 (.29 to .37) 0.44 (.35 to .53) 0.33 (.30 to .37)
0.03 (.01 to 0.06 (.04 to 0.07 (.03 to 0.06 (.04 to 0.21 (.14 to 0.16 (.13 to 0.13 (.07 to 0.17 (.14 to
0.96 (.80 to 0.97 (.94 to 1.00 (.93 to 0.98 (.95 to 0.96 (.80 to 0.84 (.78 to 0.96 (.86 to 0.88 (.83 to
Unipolar Other Grand total 4
Bipolar Unipolar Other Grand total
to 0.95) to 0.92) to 1.00) to 0.92) to 0.99) to 0.77) to 0.95) to 0.81)
.08) .09) .16) .08) .30) .20) .23) .20)
Acc .99) .99) 1.00) .99) .99) .89) .99) .91)
0.21 (.15 to 0.36 (.32 to 0.46 (.37 to 0.35 (.32 to 0.36 (.28 to 0.38 (.34 to 0.48 (.39 to 0.39 (.36 to
.29) .40) .55) .38) .44) .43) .56) .43)
Sn ¼ sensitivity; Sp ¼ specificity; PVþ ¼ predictive value of a positive test; PV ¼ predictive value of a negative test; Acc ¼ Accuracy.
References Mushquash C, Weaver B, Mazmanian D. Reporting sensitivity and specificity for suicide risk instruments: a comment on Thorell, et al. (2013). J Psychiatr Res 2014;54:144e5. DOI, http://dx.doi.org/10.1016/j.jpsychires.2014.03.014.
DOI of original article: http://dx.doi.org/10.1016/j.jpsychires.2014.03.014. * Corresponding author. Department of Psychology, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B5E1, Canada. E-mail address: [email protected] (C.J. Mushquash). http://dx.doi.org/10.1016/j.jpsychires.2014.07.010 0022-3956/© 2014 Elsevier Ltd. All rights reserved.
Thorell LH, Wolfersdorf M, Straub R, Steyer J, Hodgkinson S, Kaschka WP, et al. Electrodermal hyporeactivity as a trait marker for suicidal propensity in uniand bipolar depression. J Psychiatr Res 2013;47:1925e31.