Exhaled carbon monoxide in asthmatics: a meta-analysis.

Respir Res · 2010 · PMC2874770 · PMID 20433745

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failed to reach statistical significanceno p-value reported

Steroid-treated asthmatic patients had lower eCO levels compared to steroid-free asthmatic patients (0.79 ppm vs 1.39 ppm) but this failed to reach statistical significance.

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