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Table 2 Suicide attempt: comparison of administrative data using E-codes against suicide attempt notation in chartc, both during the past 12 months prior to and including the index date

From: Validation of key behaviourally based mental health diagnoses in administrative data: suicide attempt, alcohol abuse, illicit drug abuse and tobacco use

  Unweighted Estimates, % b (N in fraction)
Samples Agreement Sensitivity Specificity PPV NPV
Suicide Death 88 (323/368) 17 (9/53) 100 (314/315) 90 (9/10) 88 (314/358)
Control 99 (359/362) 0 (0/3) 100 (359/359) NA1 99 (359/362)
AD New User 97 (554/571) 11 (2/19) 100 (552/552) 100 (2/2) 97 (552/569)
Combineda 93 (682/730) 16 (9/56) 100 (673/674) 90 (9/10) 94 (673/720)
  Weighted Estimates, % b (95% confidence interval)
Suicide Death 87 (82, 92) 19 (5, 32) 100 (100, 100) 96 (85, 100) 87 (82, 91)
Control 100 (99, 100) 0 100 NA1 100 (99, 1.00)
AD New User 98 (95, 100) 25 (0, 72) 100 NA2 98 (95, 100)
Combineda 100 (99, 100) 2 (0, 5) 100 (100, 100) NA1 100 (99, 100)
  1. Abbreviation: NA1 is not appropriate (inappropriate to estimate because the N of the denominator is 0 for the unweighted estimate and thus the corresponding weighted estimates based partly or entirely on the control sample are also inappropriate); NA2 is not appropriate (inappropriate because weighting would be based on N = 2); AD is antidepressant; PPV is positive predictive value of an administrative diagnosis; NPV is the negative predictive value of an administrative diagnosis.
  2. a Combined sample of suicide deaths and controls
  3. b Rounded to a whole number
  4. c The chart notation had to be clear it was referring to a suicide attempt occurring in the past 12 months.