Table 2—

Baseline respiratory parameters and sleep architecture measures among adults at risk for CVD. By diabetes status, Sleep Heart Health Study 1995–1998 (N = 4,872).

CharacteristicDiabetes (n = 470)No diabetes (n = 4,402)P*
RDI5.63.4<0.001
 <5 events/h42.357.4
 5 to <10 events/h21.317.9
 10 to <15 events/h12.69.1
 ≥ 15 events/h23.815.6<0.001
OAI (%)
 ≥2 events/h33.429.50.09
 ≥3 events/h24.122.90.59
 ≥4 events/h20.218.50.42
Sleep time <90% O2 (%)
 >5%20.513.0<0.001
 >10%12.47.6<0.001
Sleep stages (mean %)§
 15.54.7<0.001
 259.556.4<0.001
 3 and 412.015.7<0.001
 REM18.720.1<0.001
CAI (%)
 ≥2 events/h4.72.60.021
 ≥3 events/h3.62.00.048
 ≥4 events/h2.51.60.222
Periodic breathing (%)3.81.80.002
  • Data are % for categorical variables and mean ± SD for continuous variables.

  • *

    * P values are for the χ2 test of independence for categorical characteristics or the t test of differences in means for continuous characteristics.

  • Data are back transformed from [log(RDI + 0.1)] for 4% O2 desaturation. Significance testing was performed on transformed data.

  • Data are for obstructive events with 4% O2 desaturation or arousal.

  • §

    § Stages 1 and 3–4 data are back transformed from [−log(−log(P + 0.001))]. Significance testing was performed on transformed data.

  • Data are for events associated with 4% O2 desaturation.