History | Positive likelihood ratio (95% confidence interval) |
Delayed menses | 2.06 (95% CI 1.65-2.57) |
1.04 (95% CI 0.38-2.87) | |
1.13 (95% CI 1.05-2.92) | |
1.56 (95% CI 1.4-1.74) | |
No contraception | 1.31 (95% CI 1.14-1.5) |
1.53 (95% CI 1.06-2.18) | |
Patient suspects that she is pregnant | 1.6 (95% CI 1.39-1.85) |
3.15 (95% CI 2.37-4.2) | |
1.6 (95% CI 1.39-1.85) | |
2.11 (95% CI 1.97-2.27) | |
Nausea and vomiting | 2.7 (95% CI 2.19-3.33) |
Any pregnancy symptoms (defined as nausea and vomiting, breast tenderness and fullness, urinary frequency, or fatigue) | 2.43 (95% CI 1.71-3.44) |
Characteristic breast changes on physical examination* | 2.71 (95% CI 2.3-3.2) |
Palpable fundus on physical examination | 2.77 (95% CI 1.7-4.51) |
Chadwick sign present¶ | 3.17 (95% CI 2.22-4.51) |
Uterine artery pulsations present | 10.98 (95% CI 5.63-21.4) |
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