TABLE 2.
Reported summary statistics.
| Author | Year | Plurality | GA at measurement (weeks) | Cutoff CL (mm) | Definition of PTB (weeks) | AUC | Sensitivity | Specificity | LR+ | LR− | % Probability of PTB | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Honest | 2003 | Singleton | <20 | 25 | 32 | 4.10 | 0.75 | |||||
| Crane | 2008 | Singleton | <20 | 25 | 32 | 3.18 | ||||||
| Honest | 2003 | Singleton | <20 | 15 | 34 | 30.53 | 0.90 | Same single study result | ||||
| Crane | 2008 | Singleton | <20 | 15 | 35 | 30.53 | Same single study result | |||||
| Honest | 2012 | Singleton | 14–20 | 15 | 34 | 142.86 | 0.89 | |||||
| Honest | 2003 | Singleton | <20 | 20 | 34 | 14.47 | 0.90 | |||||
| Domin | 2010 | Singleton | 14–25 | ≤20 | 35 | 0.89 | 22.1 | 98.2 | 12.4 | 0.40 | ||
| Honest | 2003 | Singleton | <20 | 25 | 34 | 6.29 | 0.79 | |||||
| Honest | 2009/2012 | Singleton | 14–20 | 25 | 34 | 13.38 | 0.80 | |||||
| Crane | 2008 | Singleton | <20 | 25 | 35 | 4.31 | 0.68 | |||||
| Domin | 2010 | Singleton | 14–25 | ≤25 | 35 | 0.85 | 33.3 | 95.9 | 6.30 | 0.65 | ||
| Honest | 2003 | Singleton | <20 | 30 | 34 | 2.84 | 0.75 | |||||
| Honest | 2012 | Singleton | 14–20 | 30 | 34 | 2.48 | 0.81 | |||||
| Crane | 2008 | Singleton | <20 | 30 | 35 | 3.23 | ||||||
| Leitich | 1999 | Singleton | 20 | 30 | 37 | 33 | 91 | |||||
| Honest | 2003 | Singleton | <20 | 30 | 37 | 3.77 | 0.73 | |||||
| Honest | 2003 | Singleton | 20–24 | 20 | 34 | 7.64 | 0.79 | |||||
| Honest | 2012 | Singleton | 20–24 | 20 | 34 | 7.64 | 0.79 | |||||
| Domin | 2010 | Singleton | 14–25 | ≤20 | 35 | 0.89 | 22.1 | 98.2 | 12.4 | 0.40 | ||
| Honest | 2003 | Singleton | 20–24 | 25 | 32 | 4.19 | 0.40 | |||||
| Crane | 2008 | Singleton | 20–24 | 25 | 32 | 2.38 | ||||||
| Honest | 2003 | Singleton | 20–24 | 25 | 34 | 4.40 | 0.67 | |||||
| Honest | 2009 | Singleton | 20–24 | 25 | 34 | 4.68 | 0.68 | |||||
| Crane | 2008 | Singleton | 20–24 | 25 | 35 | 2.78 | 0.55 | |||||
| Domin | 2010 | Singleton | 14–25 | ≤25 | 35 | 0.85 | 33.3 | 95.9 | 6.30 | 0.65 | ||
| Honest | 2003 | Singleton | 20–24 | 30 | 34 | 2.28 | 0.60 | |||||
| Crane | 2008 | Singleton | 20–24 | 30 | 35 | 1.75 | ||||||
| Honest | 2009/2012 | Singleton | 20–24 | 32.5 | 37 | 3.99 | 0.33 | |||||
| Domin | 2010 | Singleton | 14–25 | ≤33.15 | 37 | 0.83 | 32.7 | 90 | 4.90 | 0.60 | ||
| Honest | 2003 | Singleton | >24 | 15 | 34 | 7.08 | 0.93 | |||||
| Crane | 2008 | Singleton | >24 | 15 | 35 | 5.64 | ||||||
| Honest | 2003 | Singleton | >24 | 20 | 34 | 5.83 | 0.81 | |||||
| Crane | 2008 | Singleton | >24 | 20 | 35 | 5.16 | ||||||
| Honest | 2003 | Singleton | >24 | 25 | 34 | 4.07 | 0.62 | |||||
| Crane | 2008 | Singleton | >24 | 25 | 35 | 4.01 | 0.72 | |||||
| Honest | 2003 | Singleton | >24 | 30 | 34 | 2.70 | 0.52 | |||||
| Crane | 2008 | Singleton | >24 | 30 | 35 | 2.23 | ||||||
| Honest | 2003 | Singleton | >24 | 30 | 37 | 2.49 | 0.79 | |||||
| Crane | 2008 | Singleton | >24 | 30 | 37 | 2.27 | ||||||
| Honest | 2003 | Twin | 20 | 20 | 34 | 59.89 | 0.71 | |||||
| Lim | 2011 | Twin | not specified | 20 | 34 | 30 | 94 | 5.00 | 0.74 | |||
| Conde‐Agudelo | 2014 | Twin | 20–24 | 20 | 34 | 29 | 97 | 9.00 | 0.74 | |||
| Kindinger | 2016 | Twin | 20 | 20 | 32–36 | 20.60 | ||||||
| Kindinger | 2016 | Twin | 22 | 20 | 32–36 | 26.50 | ||||||
| Kindinger | 2016 | Twin | 24 | 20 | 32–36 | 33.10 | ||||||
| Conde‐Agudelo | 2010 | Twin | 20–24 | ≤25 | 32 | 0.8 | 54 | 91 | 6.00 | 0.51 | ||
| Conde‐Agudelo | 2014 | Twin | 20–24 | 25 | 32 | 10.10 | 0.64 | |||||
| Kindinger | 2016 | Twin | 20 | 25 | 28–32 | 35.00 | ||||||
| Kindinger | 2016 | Twin | 22 | 25 | 28–32 | 32.40 | ||||||
| Kindinger | 2016 | Twin | 24 | 25 | 28–32 | 29.30 | ||||||
| Honest | 2003 | Twin | 20–24 | 25 | 34 | 5.02 | 0.75 | |||||
| Lim | 2011 | Twin | not specified | 25 | 34 | 36 | 94 | 6.00 | 0.68 | |||
| Conde‐Agudelo | 2014 | Twin | 20–24 | ≤25 | 34 | 40 | 93 | 5.80 | 0.65 | |||
| Kindinger | 2016 | Twin | 20 | 25 | 32–36 | 25.00 | ||||||
| Kindinger | 2016 | Twin | 22 | 25 | 32–36 | 31.10 | ||||||
| Kindinger | 2016 | Twin | 24 | 25 | 32–36 | 37.60 | ||||||
| Honest | 2003 | Twin | 20–24 | 30 | 34 | 2.31 | 0.69 | |||||
| Conde‐Agudelo | 2010 | Twin | 20–24 | 30 | 34 | 56 | 81 | 3.00 | 0.55 | |||
| Kindinger | 2016 | Twin | 20 | 30 | 32–36 | 28.50 | ||||||
| Kindinger | 2016 | Twin | 22 | 30 | 32–36 | 34.30 | ||||||
| Kindinger | 2016 | Twin | 24 | 30 | 32–36 | 40.30 | ||||||
| Honest | 2003 | Twin | >24 | 25 | 34 | 1.82 | 0.83 | |||||
| Conde‐Agudelo | 2010 | Twin | >24 | 25 | 34 | 44 | 81 | 2.30 | 0.70 | |||
| Kindinger | 2016 | Twin | 24 | 25 | 32–36 | 37.60 | ||||||
| Kindinger | 2016 | Twin | 26 | 25 | 32–36 | 44.30 | ||||||
| Honest | 2003 | Twin | >24 | 25 | 37 | 1.89 | 0.73 | |||||
| Conde‐Agudelo | 2010 | Twin | >24 | 25 | 37 | 43 | 77 | 1.80 | 0.75 | |||
| Conde‐Agudelo | 2014 | Twin | 20–24 | 25 | 37 | 21 | 95 | 4.40 | 0.80 | |||
| Kindinger | 2016 | Twin | 24 | 25 | ≥36 | 19.00 | ||||||
| Kindinger | 2016 | Twin | 26 | 25 | ≥36 | 19.40 | ||||||
| Honest | 2003 | Twin | >24 | 30 | 34 | 2.11 | 0.61 | |||||
| Lim | 2011 | Twin | not specified | 30 | 34 | 41 | 87 | 3.15 | 0.32 | |||
| Kindinger | 2016 | Twin | 24 | 30 | 32–36 | 40.30 | ||||||
| Kindinger | 2016 | Twin | 26 | 30 | 32–36 | 46.30 | ||||||
| Honest | 2003 | Twin | >24 | 35 | 34 | 1.84 | 0.29 | |||||
| Lim | 2011 | Twin | not specified | 35 | 34 | 78 | 66 | 2.29 | 0.33 | |||
| Kindinger | 2016 | Twin | 24 | 35 | 32–36 | 40.70 | ||||||
| Kindinger | 2016 | Twin | 26 | 35 | 32–36 | 45.90 |
Note: Cells are blank where a summary statistic was not reported. Italicised numbers were not reported in the original paper, but calculated from data in the review.
Abbreviations: AUC, area under the curve; CL, cervical length; GA, gestational age; LR, likelihood ratio; PTB, preterm birth.