Table 1.
Demographic characteristics and polysomnography parameters overall and by desaturation
| Characteristic | All patients (n=319) |
With desaturation (n=20)* |
Without desaturation (n=299)* |
P value† |
|---|---|---|---|---|
| Age, years | 5 (3–8) | 2 (1–3) | 6 (3–8) | <0.001 |
| Male sex, no. (%) | 168 (52.7) | 11 (55) | 157 (53) | 0.99 |
| BMI-for-age percentile‡ | 84.6 (53.7–98.5) | 85.6 (36.4–99.1) | 84.5 (53.7–98.5) | 0.92 |
| Race, no. (%) | 0.17 | |||
| Caucasian | 104 (32.6) | 4 (20) | 100 (33) | |
| African-American | 196 (61.4) | 16 (80) | 180 (60) | |
| Other or unknown | 19 (5.9) | 0 (0) | 19 (6) | |
| RDI, events/hour | 5.9 (2.3–15.3) | 14.1 (3.0–24.5) | 5.5 (2.3–13.7) | 0.08 |
| Obstructive sleep apnea, no. (%) |
0.09 | |||
| None | 40 (12.5) | 3 (15) | 37 (12) | |
| Mild | 106 (33.2) | 3 (15) | 103 (34) | |
| Moderate | 59 (18.5) | 2 (10) | 57 (19) | |
| Severe | 114 (35.7) | 12 (60) | 102 (34) | |
| Obstructive apnea index, events/hour |
1.9 (0.4–7.6) | 6.9 (0.4–10.8) | 1.8 (0.4–6.8) | 0.11 |
| Hypopnea index, events/hour |
2.3 (0.8–6.1) | 3.5 (1.1–11.0) | 2.3 (0.8–5.6) | 0.38 |
| Central apnea index, events/hour |
0.0 (0.0–0.2) | 0.0 (0.0–0.2) | 0.0 (0.0–0.2) | 0.99 |
| Peak CO2, mmHg | 52 (49–55) | 55.5 (48.5–63.5) | 52 (49–55) | 0.02 |
| Opioid use, no. (%) | 295 (92.5) | 17 (85) | 278 (93) | 0.18 |
| Percent O2 saturation nadir |
88 (81–92) | 80.5 (74.5–90.5) | 88.0 (82–92) | 0.048 |
Data are presented as medians and interquartile ranges unless otherwise specified.
BMI, body mass index; RDI, respiratory disturbance index; O2, oxygen
Missing data: for BMI-for-age percentile, 9 with desaturation and 92 without desaturation were missing; for O2 saturation nadir, 1 without desaturation was missing; for obstructive apnea index and hypopnea index, 7 without desaturation were missing; for central apnea index, 10 without desaturation were missing.
P values are from the Wilcoxon rank-sum test or Fisher’s exact test.
BMI-for-age percentile is the percentile of BMI normalized for age and gender in children. CDC calculator used: http://www.cdc.gov/healthyweight/assessing/bmi/childrens_bmi/tool_for_schools.html.