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. 2008 Mar 1;31(3):367–374. doi: 10.1093/sleep/31.3.367

Figure 5.

Figure 5

Comparison of collapsibility index, as a measure of upper airway collapsibility, between primary Sjögren's syndrome and non-primary Sjögren's syndrome controls during wake, stage 2 and SWS. Collapsibility index was calculated from ensemble averaged pulses for each state using the formula: minimum Pcho − Pepi pressure (at minimum Pcho)/ minimum Pcho; expressed as a percentage. *P < 0.05 compared to wake. Values are mean ± SEM. Primary Sjögren's syndrome wake, n = 11; primary Sjögren's syndrome stage 2 sleep, n = 9; primary Sjögren's syndrome slow-wave sleep (SWS), n = 7; controls wake and stage 2 sleep, n = 8; controls SWS, n = 7.