Table 1.

Study eligibility criteria

INCLUSION CRITERIA	EXCLUSION CRITERIA
• ≥ 18 years of age • Pregnant and ≥ 37 weeks’ gestation • Able and willing to wear a wristwatch for 2–6 weeks	• Previous skin irritation or hypersensitivity to silicone • Intrauterine fetal death • In active labour at the time of recruitment • Inability to provide written informed consent