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. Author manuscript; available in PMC: 2019 Jan 7.
Published in final edited form as: Environ Epidemiol. 2018 Jun 21;2(3):e017. doi: 10.1097/EE9.0000000000000017

Table 2.

Characteristics of Uterine Vascular Resistance at Each Visit

Uterine vascular resistance Total n Mean ± SD n (%)
Visit 1, gestational age at first visit (weeks) 560 19.2 ± 0.9
Uterine artery pulsatility index 558 0.74 ± 0.18
Uterine artery resistance index 558 0.53 ± 0.09
Uterine artery S/D ratio 558 2.39 ± 0.77
Presence of unilateral uterine artery notching 553 133 (24.1)
Presence of bilateral uterine artery notching 553 230 (41.6)
Visit 2, gestational age at second visit (weeks) 542 28.8 ± 0.8
Uterine artery pulsatility index 539 0.61 ± 0.14
Uterine artery resistance index 539 0.46 ± 0.08
Uterine artery S/D ratio 539 1.99 ± 0.44
Presence of unilateral uterine artery notching 536 124 (23.1)
Presence of bilateral uterine artery notching 536 128 (23.9)
Visit 3, gestational age at third visit (weeks) 486 36.7 ± 0.7
Uterine artery pulsatility index 486 0.59 ± 0.13
Uterine artery resistance index 486 0.45 ± 0.07
Uterine artery S/D ratio 486 1.92 ± 0.34
Presence of unilateral uterine artery notching 485 117 (24.1)
Presence of bilateral uterine artery notching 485 116 (23.9)

S/D, systolic/diastolic.