Investigation of consistency in sleep quality evaluation using a Fitbit device compared to a structured questionnaire among breastfeeding mothers in Ho Chi Minh City, Vietnam

BACKGROUND: A new health monitoring device called Fitbit Charge 6 has appeared on the Vietnamese market. This study aimed to evaluate the consistency between Fitbit Charge 6 and structured interview questions in measuring sleep quality among breastfeeding mothers. RESEARCH DESIGN AND METHODS: A cross-sectional study utilizing random convenience sampling was conducted in Ho Chi Minh City, Vietnam, involving 208 breastfeeding women one month postpartum. The participants used the Fitbit Charge 6 device continuously for four days and three nights to gather daily sleep information; then, they were administered a structured sleep questionnaire via home interviews. RESULTS: = 0.25). The agreement between the Fitbit Sleep Score and sleep satisfaction from the questionnaire was 79.9%, with a notably low kappa coefficient (0.02), indicating a lack of strong agreement. CONCLUSION: The Fitbit Charge 6 did not show reliable correlation with the subjective sleep data reported by one-month postpartum breastfeeding women. Further research employing rigorous comparative studies is necessary to assess the validity and reliability of sleep data collection methods for this demographic.