Table 2:

Performance of two case-finding questions (index test) and an additional question about the need for help in identifying perinatal depression

MeasureAntenatal phasePostnatal phase
Case-finding questions*
n = 126
Question about need for help
n = 52
Case-finding questions*
n = 94
Question about need for help
n = 45
True positive, no.1710187
False negative, no.07011
True negative, no.74324927
False positive, no.353270
Sensitivity, % (95% CI)100 (77–100)58 (38–76)100 (78–100)39 (18–64)
Specificity, % (95% CI)68 (58–76)91 (78–97)65 (53–75)100 (85–100)
Positive likelihood ratio (95% CI)3.03 (2.28–4.02)6.86 (2.16–21.7)2.73 (2.0–3.74)21.4 (1.3–354.2)
Negative likelihood ratio (95% CI)0.041 (0.003–0.63)0.45 (0.25–0.80)0.042 (0.003–0.65)0.62 (0.43–0.90)
  • Note: CI = confidence interval.

  • * There were no missing responses to the case-finding questions. A positive response to either of the two questions was considered a positive screen.

  • This is the number of women who also completed the telephone interview. A total of 152 women (antenatal phase) and 97 women (postnatal phase) answered the case-finding questions.

  • Responses to an additional question about the need for help were elicited only from participants with a positive response to either of the case-finding questions.