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Forest plots: pooled data on gas exchange. Change in PCO2 after 1 month on HMV (a); change in PO2 after 1 month on HMV (b); change in SaO2 after 1 month on HMV (c). PCO2, partial pressure of carbon dioxide in blood; PO2, partial pressure of oxygen in blood; SaO2, oxygen saturation; HMV, home mechanical ventilation.
