Table 1

Sleep AHEAD participant characteristics at baseline

Total Sleep AHEAD participantsSleep AHEAD participants (male)Sleep AHEAD participants (female)P
n305122183
Race/ethnicity (%)<0.0001
    White73.090.161.8
    African American19.16.627.3
    Other7.93.310.9
Postmenopause90.1N/A90.1n/a
Age (years)61.3 ± 6.561.4 ± 7.161.3 ± 6.10.89
BMI (kg/m2)36.5 ± 5.836.1 ± 5.636.7 ± 5.90.34
Weight (kg)101.7 ± 18.0110.9 ± 16.595.6 ± 16.2<0.0001
Height (cm)167.0 ± 9.7175.5 ± 7.0161.3 ± 6.6<0.0001
Waist circumference (cm)115.0 ± 13.0120.9 ± 12.1111.0 ± 12.1<0.0001
Neck circumference (cm)41.1 ± 4.444.4 ± 3.239.0 ± 3.1<0.0001
A1C7.2 ± 1.17.4 ± 1.17.1 ± 1.00.03
Total sleep time (h)6.0 ± 1.25.8 ± 1.36.1 ± 1.10.03
Sleep efficiency (%)77.5 ± 11.177.1 ± 11.877.7 ± 10.60.69
Time in non-REM stages (h)4.9 ± 1.04.9 ± 1.15.0 ± 1.00.32
Time in REM stages (h)1.0 ± 0.50.9 ± 0.51.1 ± 0.50.002
Sleep time supine (h)2.1 ± 2.01.9 ± 1.92.2 ± 2.10.21
Obstructive apnea index11.1 ± 12.814.2 ± 15.59.1 ± 10.20.008
Central apnea index0.4 ± 1.00.6 ± 1.20.3 ± 0.70.003
Hypopneas with ≥4% oxygen desaturation*
    Apnea-hypopnea index20.5 ± 16.824.6 ± 18.617.8 ± 15.00.001
    Hypopnea index9.0 ± 8.19.8 ± 8.38.4 ± 8.00.16
Oxygen desaturation index (≥4%)17.6 ± 14.720.0 ± 15.915.9 ± 13.70.03
Participants that spent >10% of time below 90% saturation (%)16.120.513.10.11
Oxygen saturation nadir81.4 ± 8.381.2 ± 7.581.6 ± 8.80.65
Epworth Sleepiness Score7.9 ± 4.68.0 ± 4.57.8 ± 4.70.80
  • Data are means ± SD.

  • *See Ref. (5).

  • †Based on oxygen desaturation events ≥4% (5). REM, rapid eye movement.