Table 1

Participant, Exposure, Comparator, Outcome and Study design (PECOS) criteria used in the systematic review

AlphabetCorresponding termStudy term
PPopulation

  • Pregnant women with singleton births.

  • Neonates.

EExposure

  • Physical and/or visual exposure to green space, considering both its quantity and quality.

  • Physical and/or visual exposure to blue space, considering both its quantity and quality.

  • Physical and/or visual exposure to both GBS, considering both their quantity and quality.

CComparator

  • Those exposed to the lowest level of GBS.

  • Those who are not exposed to GBS.

OOutcome

  • Pregnancy complications.

  • Pregnancy-related outcomes within the postpartum period (up to 1 year after gestation).

  • Birth outcomes.

SStudy design

  • Experiments.

  • Quasi-experiments.

  • Cohort studies.

  • Case–control studies.

  • Longitudinal studies.

  • Studies with mediation analysis.

  • GBS, green and blue space.