Unverified90% confidenceDecision RuleTime unknown
电子秤放置于硬质平整地面（非地毯、地板缝隙），孕晚期读数波动多因秤脚受力不均而非体重真实变化，软地面会使读数偏差达1-2kg
1
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90%
Confidence
Long-term
Relevance
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Unverified脚大或需赤脚站稳者应选平台面积≥320×320mm的款式，小平台（260mm以下）会导致站姿重心不稳、读数波动，且四电极款需双脚完整接触电极片67% similarUnverified四电极（仅双脚接触）体脂秤只能测量下半身阻抗后推算全身，八电极（手脚共八点接触）方案分段测量四肢+躯干，体脂率误差可从±5%降至±2-3%，需要精准数据选八电极64% similarUnverified尺码测量应量踝关节最细处（内外踝上方）而非脚踝围，误差超过2cm会导致套筒过松失去支撑或过紧影响血液循环62% similarUnverified根据身高选睡袋以脚部有5-10cm余量为宜，过长脚部空间过大会让宝宝下滑，过短则蜷缩不适，多数品牌按身高分档（如50-70cm/70-90cm/90-110cm）61% similarUnverified尺寸适配需匹配脚踝围而非单纯月龄，主流产品通常提供2-3个尺码档（如适用2.7-4.5kg小号、4-6.8kg中号、5.9-13.6kg大号），过紧压迫血流影响血氧读数，过松易脱落漏报61% similar
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