Table 2 Baseline characteristics from included studies
From: Spiral artery blood flow during pregnancy: a systematic review and meta-analysis
| Â | Study design | Healthy pregnancies (n) | Complicated pregnancies (n) | Probe | Doppler | MHz | Gestational age at measurement (weeks) | Outcome |
|---|---|---|---|---|---|---|---|---|
Alouini (ref. [20]) | Prospective longitudinal | 49 | / | Transvaginal | Colour | 6 | 5–10 | PSV |
Coppens (ref. [21]) | Prospective longitudinal | 37 | / | Transvaginal | Colour | 6–9 | 8–14 | PI |
Deurloo (ref. [2]) | Prospective longitudinal | 86 | 21a | Transabdominal | Colour | 3.5 | 11–13; 14–17; 18–24 | PI, RI |
Deurloo (ref. [22]) | Prospective longitudinal | 97 | / | Transabdominal | Colour | 3.5 | 11–13; 14–17; 18–24 | PI |
Hsieh (ref. [23]) | Prospective longitudinal | 94 | / | Transabdominal | Colour | 3.5 | 10–15; 15–20; 20–25; 25–30; 30–35; 35–40 | PI, RI, PSV |
Kurjak (ref. [24]) | Cross-sectional | 115 | / | Transvaginal + transabdominal | Colour | 3.5 / 5 | 7–42 | PI, RI, PSV |
Kurjak (ref. [25]) | Prospective cross-sectional | 60 | 54a | Transvaginal | Colour | 6 | 6–12 | PI, RI |
Mäkikallio, Jouppila (ref. [26]) | Prospective cross-sectional | 31 | 10c | Transvaginal | Colour | 5 | 6; 8; 9; 11 | RI |
Mäkikallio, Tekay (ref. [27]) | Prospective longitudinal | 16 | / | Transabdominal | Colour | 5 | 5; 7; 8; 10 | PI, PSV |
Matijevec (ref. [9]) | Prospective cross-sectional | 64 | / | Transabdominal | Colour | 5 | 17–20 | PI, RI |
Ozkan (ref. [15]) | Prospective longitudinal | 189 | 25b | Transvaginal | Colour | 12 | 5–12 | PI, RI |
Ozkaya (ref. [28]) | Prospective cross-sectional | 84 | 16c | Transvaginal | Colour | 6 | 6–12 | PI, RI |