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Table 2 Measured and self-reported wear time of the smart wristband during pregnancy and after delivery

From: Feasibility of smart wristbands for continuous monitoring during pregnancy and one month after birth

Weeks of pregnancy/postpartum Second trimester, weeks 13–28 n = 20 Third trimester, weeks 29–41 n = 18 Postpartum, weeks 1–4 after delivery n = 13
Wear time, h/day
Adjusted mean (95% CI) 17.9 (15.2–20.7) 16.7 (13.8–19.5) 14.4 (11.4–17.4)
 • Min (h/day) 4.3 4.9 1.7
 • Max (h/day) 23.6 23.7 23.8
Self-reported wear time
 • All the time 15 (75%) 14 (78%) 9 (69%)
 • Several days/week 5 (25%) 4 (22%) 4 (31%)
 • Once a week 0 0 0
 • Not at all 0 0 0
The agreement between objective and self-reported
 Wear timea Slight Fair Moderate
 κ (p-value) 0.13 (0.412) 0.38 (0.05) 0.514 (<0.001)
  1. a For the inter-rater agreement the objective wear time was categorized for each trimester and postpartum period as follows: All the time: 7 days/week ≥20 h/day; Several days/week: ≥ 3 days/week; Once a week: ≥ 1 day/week; Not at all: 0 h/week