Measure | Antenatal phase | Postnatal 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. | 17 | 10 | 18 | 7 |

False negative, no. | 0 | 7 | 0 | 11 |

True negative, no. | 74 | 32 | 49 | 27 |

False positive, no. | 35 | 3 | 27 | 0 |

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.