Table 1 Characteristics of individual studies included in the meta-analysis
Authors (year) | Country | Sample (N) | Prospective | Recruit patients | Detection of progesterone | Cut-off ng/mL | Supplement | Data extraction | Outcome assessment (weeks) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Location | Age (years) | Gestation (weeks) | Tp | Fp | Fn | Tn | Time | Method | ||||||||
Kadam [21] (2019) | India | 150 | Yes | Outpatient | UK | < 12 | Enzyme | 11 | UK | 41 | 17 | 4 | 88 | < 13 | Ultrasound | |
Kant [20] (2015) | India | 100 | Yes | Outpatient | 20–39 | < 12 | Enzyme | 24 | UK | 16 | 3 | 5 | 76 | 20 | Follow up | |
Ku [26] (2015) | Singapore | 119 | Yes | Emergency | > 19 | 6–10 | CL | 11 | UK | 23 | 11 | 7 | 78 | < 17 | Follow up | |
LeK [24] (2017) | Singapore | 345 | Yes | Emergency | > 21 | 6–10 | CL | 11 | UK | 46 | 22 | 24 | 253 | 16 | Follow up | |
Jia [23] (2018) | Singapore | 118 | Yes | Emergency | 21–45 | 6–10 | CL | 11 | Yes | 10 | 8 | 5 | 95 | < 16 | Follow up | |
Tan [25] (2020) | Singapore | 1087 | Yes | Emergency | UK | 5–12 | CL | 11 | Yes | 170 | 70 | 81 | 766 | 16 | Follow up | |
Duan [16] (2011) | China | 175 | No | Outpatient | UK | 4–5 | Enzyme | 16 | Yes | 51 | 32 | 16 | 76 | Live birth | Follow up | |
Wei [18] (2022) | China | 141 | UK | Hospitalized | 22–43 | 5–12 | CL | 22 | Yes | 16 | 10 | 10 | 105 | 16 | Follow up | |
Zheng [19] (2021) | China | 173 | UK | Outpatient | > 20 | 5–6 | CL | 10 | Yes | 38 | 21 | 14 | 100 | 12 | Follow up | |
Li [17] (2019) | China | 100 | No | Outpatient | 22–35 | 5–7 | UK | 10 | Yes | 18 | 10 | 8 | 64 | 12 | Follow up | |
Shen [15] (2013) | China | 76 | UK | Outpatient | UK | < 12 | CL | 30 | Yes | 38 | 7 | 6 | 25 | Live birth | Follow up | |
McLindon [22] (2023) | Australia | 133 | Yes | Outpatient | > 18 | < 10 | UK | 8 | Yes | 8 | 2 | 15 | 108 | Live birth | Follow up | |
128 | No | 4 | 1 | 17 | 106 | |||||||||||
133 | 16 | Yes | 17 | 42 | 6 | 68 | ||||||||||
128 | No | 14 | 41 | 7 | 66 | |||||||||||