Table 1 also shows the results for tests 3 to 7. Devices F1, F3, F4, F5, F7, and O2 increased the pressure at different rates in the presence of obstructive hypopneas (test 3, panel D in Fig 2), but devices F2, F6, O1, and O3 did not modify the applied pressure. All the devices except O3 increased the pressure in the presence of obstructive hypopneas with snoring (test 4, panel E in Fig 2), some of them (devices F2, F3, F6, F7, and O1) with a higher speed than without snoring. Those devices responding to snoring, except F5, increased the pressure up to the maximum level allowed (16 cm H2O). During a prolonged period of flow limitation (test 5, panel F in Fig 2), devices F2, F4, F5, O1, and O2 increased the pressure at different rates while the other devices did not show any response. When the APAP devices were subjected to a period of mouth expiration (test 6, panel G in Fig 2), six of the devices (F2, F3, F5, F6, F7, and O2) did not increase the applied pressure. However, four devices (F1, F4, O1, and O3) detected this artifact as an event and increased the pressure above 10 cm H2O. During the test in the presence of leaks (test 7), devices F3, F4, F5, F7, O2, and O3 modified their response during apneas with obstruction. Devices F3 and O2 increased the pressure more rapidly than without leaks, devices F4 and O3 slightly reduced the speed of pressure increase, F5 did not modify the pressure and F7 increased the pressure up to 5 cm H2O. The other devices were not affected by the presence of leaks and increased the pressure with the same rate as in the test without leaks.