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Fig 1.

Study protocol.

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Fig 1 Expand

Fig 2.

Severity of airflow limitation in COPD patients.

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Fig 2 Expand

Table 1.

Baseline characteristics of the study groups (mean±SD).

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Table 1 Expand

Table 2.

Sleep characteristics of the three groups (mean±SD or 1st quartile/median/3rd quartile).

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Table 2 Expand

Table 3.

Questionnaires’ results.

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Table 3 Expand

Fig 3.

Correlation between BMI and AHI.

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Fig 3 Expand

Table 4.

Characteristics of the study groups (mean±SD) after 3 months of CPAP.

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Table 4 Expand