Maternal Use of Induction Heating Cookers During Pregnancy and Birth Outcomes: The Kyushu Okinawa Maternal and Child Health Study

Abstract

Maternal Use of Induction Heating Cookers During Pregnancy and Birth Outcomes: The Kyushu Okinawa Maternal and Child Health Study Akiko Tokinobu, Keiko Tanaka, Masashi Arakawa, Yoshihiro Miyake. Maternal Use of Induction Heating Cookers During Pregnancy and Birth Outcomes: The Kyushu Okinawa Maternal and Child Health Study. Bioelectromagnetics. 2021 Apr 12. doi: 10.1002/bem.22339. Abstract The effects of exposure to intermediate-frequency electromagnetic fields (IF-EMFs) during pregnancy on birth outcomes are uncertain. We investigated the association between the use of induction heating (IH) cookers, which are major sources of IF-EMFs, during pregnancy and preterm birth (PTB), low birth weight (LBW), small- for-gestational-age (SGA), and birth weight, using data from a prebirth cohort study in Japan. Study participants were 1,565 mothers with singleton pregnancies and the babies born from these pregnancies. We collected the data presented here using self-administered questionnaires. An adjustment was made for maternal age, region of residence, number of children, family structure, maternal education, maternal employment, maternal alcohol intake, smoking during pregnancy, maternal body mass index, baby's sex, and gestational age at birth. IH cooker use during pregnancy was independently associated with a reduced risk of PTB: the adjusted odds ratio was 0.28 (95% confidence interval: 0.07-0.78). IH cooker use during pregnancy was not associated with LBW, SGA, or birth weight. This is the first study to show that IH cooker use during pregnancy is independently inversely associated with PTB. pubmed.ncbi.nlm.nih.gov

AI evidence extraction

Main findings

In this Japanese prebirth cohort (n=1,565), induction heating (IH) cooker use during pregnancy was associated with a reduced risk of preterm birth (adjusted OR 0.28, 95% CI 0.07–0.78). IH cooker use was not associated with LBW, SGA, or birth weight.

Outcomes measured

• preterm birth (PTB)
• low birth weight (LBW)
• small-for-gestational-age (SGA)
• birth weight

Limitations

• Exposure assessed via self-administered questionnaires (self-reported IH cooker use)
• Frequency/intensity metrics for IF-EMF exposure not reported in abstract

{
    "study_type": "cohort",
    "exposure": {
        "band": "intermediate-frequency",
        "source": "induction heating cooker",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "during pregnancy"
    },
    "population": "Pregnant mothers with singleton pregnancies and their babies (Japan)",
    "sample_size": 1565,
    "outcomes": [
        "preterm birth (PTB)",
        "low birth weight (LBW)",
        "small-for-gestational-age (SGA)",
        "birth weight"
    ],
    "main_findings": "In this Japanese prebirth cohort (n=1,565), induction heating (IH) cooker use during pregnancy was associated with a reduced risk of preterm birth (adjusted OR 0.28, 95% CI 0.07–0.78). IH cooker use was not associated with LBW, SGA, or birth weight.",
    "effect_direction": "mixed",
    "limitations": [
        "Exposure assessed via self-administered questionnaires (self-reported IH cooker use)",
        "Frequency/intensity metrics for IF-EMF exposure not reported in abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "intermediate-frequency EMF",
        "induction heating cooker",
        "pregnancy",
        "birth outcomes",
        "preterm birth",
        "low birth weight",
        "small-for-gestational-age",
        "Japan",
        "cohort"
    ],
    "suggested_hubs": []
}

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