TABLE 1

Participant Characteristics

VariableTotal Sample (N = 185)
Demographics
 Age, y7.0 ± 1.4
 Male gender, n (%)84 (45.4%)
 Race, n (%)
  African American97 (52.4%)
  Caucasian67 (36.2%)
  Asian4 (2.2%)
  Other17 (9.2%)
 Hispanic ethnicity, n (%)12 (6.5%)
 Maternal education less than high school, n (%)16 (8.8%)
 Household income <$30 000,a n (%)69 (45.4%)
 Obese, BMI ≥95th percentile, n (%)75 (40.5%)
PSG findings
 Respiratory
  AHI, median (IQR); range4.8 (6.4); 1.2–27.7
  ODI3%, median (IQR); range4.9 (8); 0.0–32.8
  ETco2 >50 mm Hg,b % total sleep time, median (IQR); range2.0 (13.5); 0–86.8
  Obstructive hypoventilation,b n (%)25 (16.1%)
 Sleep
  Arousal index8.7 ± 3.2
  Total sleep time, min457.7 ± 54.5
   % Sleep time in stage N18.7 ± 4.3
   % Sleep time in stage N241.3 ± 7.5
   % Sleep time in stage N331.2 ± 7.2
   % Sleep time in stage REM18.8 ± 4.3
PSQ scale
 Total score,c range0.49 ± 0.18; 0.05–0.95
  Snoring subscale, range0.77 ± 0.27; 0.00–1.00
  Sleepiness subscale, range0.44 ± 0.34; 0.00–1.00
  Behavioral subscale0.44 ± 0.33; 0.00–1.00
  • Categorical data are reported as number and percentage. Plus–minus values are means ± SD, and nonnormally distributed data are reported as medians and IQRs. N1, non-REM stage 1 sleep; N2, non-REM stage 2 sleep; N3, non-REM stage 3 sleep.

  • a Data for household income are missing for 33 participants.

  • b Number of participants with obstructive hypoventilation defined as ETco2 value >50 mm Hg for ≥25% of total sleep time. Data are missing on ETco2 and hypoventilation for 30 participants. Available participants all have quality CO2 signals for ≥50% of the sleep time.

  • c PSQ total score ≥0.33 indicates high risk for OSAS.