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Table 2 Baseline characteristics from included studies

From: Spiral artery blood flow during pregnancy: a systematic review and meta-analysis

  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
  1. N amount patients, MHz Megahertz, PI pulsatility index, RI resistance index, PSV peak systolic velocity
  2. aAbsolute data not available
  3. bMiscarriage
  4. cPre-eclampsia, preterm labour, intra uterine growth restriction, missed abortion, miscarriage and placental abruption