Respiratory parameters recorded during non-REM and REM sleep in WT or PRKO female mice treated with vehicle (Veh) or progesterone (Prog).

<p><b>A:</b> Minute ventilation (ml/min/100 g), <b>B:</b> Tidal volume (ml/100 g), <b>C:</b> Respiratory frequency (breaths/min). *, and **, respectively P<0.05 and 0.01 for the effect of progesterone treatment in WT or PRKO mice. °, °°, °°°, and °°°°: respectively P<0.05, 0.01, 0.001 and 0.0001 REM sleep vs. non-REM sleep.