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  <description>SOXAI Ring 2とOura Ring Gen4を75夜同時装着。平均差3.5点なのに1夜ごとの差は平均12.6点、最大41点。相関r=0.67。スコアが割れる理由と用途別の選び方を実測データで解説。</description>
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  <published>2026-07-07 08:30:29</published>
  <title>SOXAI Ring 2とOura Ring Gen4を75夜同時比較</title>
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