936, 95% CI: 0.913–0.958) worse initial physical function, and about an additional 0.5% (IRR = 0.995, 95% CI: 0.994–0.996) worsening every year compared to those without osteoarthritis, though this additional slowing was only borderline significant.
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Contribution of common chronic conditions to midlife physical function decline: The Study of Women's Health Across the Nation.
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The sentences
This would bias our results towards the null and could account for some of our marginally significant results.