Table 1.
Characteristics of the Study Population
| All | SDB Status | ||||
|---|---|---|---|---|---|
| (N=616) | No SDB AHI < 1 (N=450) |
Mild SDB AHI 1 – 5 (N=159) |
Moderate SDB AHI ≥ 5 (N=7) |
p-value | |
| Age (Months) | 112 (21) | 110 (21) | 112 (19) | 117 (17) | NS |
| Male (%) | 49 | 48 | 52 | 15 | < 0.05 |
| Race (% non-Caucasian) | 25 | 20 | 36 | 0 | < 0.05 |
| BMI Percentile | 61 (29) | 59 (30) | 66 (28) | 59 (41) | < 0.05 |
| REM Sleep (%) | 20 (5.6) | 20 (5.9) | 20 (4.9) | 18 (6.8) | NS |
| Sleep Efficiency (%) | 86 (8.5) | 85 (8.6) | 87 (7.9) | 80 (7.8) | NS |
| Snore (%) | 24 | 20 | 34 | 65 | < 0.05 |
| AHI (# / hr sleep) | 0.79 (1.03) | 0.29 (0.27) | 1.98 (0.80) | 5.79 (0.93) | < 0.01 |
| Systolic BP (mmHg) | 111 (12) | 110 (12) | 113 (11) | 128 (11) | < 0.01 |
| Diastolic BP (mmHg) | 65 (8) | 65 (8) | 65 (7) | 72 (5.3) | NS |
| One night (9 hours) HRV | |||||
| Log-HF (ms2) | 6.70 (0.84) | 6.67 (0.86) | 6.83 (0.77) | 5.91 (0.73) | < 0.01 |
| Log-LF (ms2) | 6.57 (0.66) | 6.55 (0.66) | 6.65 (0.64) | 6.37 (0.71) | NS |
| LF/HF Ratio | 0.98 (0.53) | 1.00 (0.55) | 0.91 (0.42) | 1.69 (0.62) | < 0.01 |
| SDNN (ms) | 94 (27.4) | 93 (27.1) | 98 (28.2) | 85 (23.1) | NS |
| RMSSD (ms) | 73 (34.0) | 72 (34.2) | 78 (33.3) | 45 (15.5) | < 0.01 |
| Heart Rate (bpm) | 77 (8.2) | 77 (8.2) | 76 (8.4) | 79 (6.8) | NS |
NS Not significant (p > 0.05)
Log-LF log transformed low frequency power
Log-HF log transformed high frequency power
LF/HF the ratio of LF and HF
SDNN the standard deviation of all RR intervals (ms)
RMSSD the square root of the mean of the sum of the squares of differences between adjacent RR intervals (ms)