Clinical Study

Oximetry Signal Processing Identifies REM Sleep-Related Vulnerability Trait in Asthmatic Children

Table 2

Polysomnographic parameters of subjects.

Factors/variablesControl ( , 66%)Asthma ( , 34%) value

Sleep study parameters
 Events/hr; mean (SD) 0.35 (0.4)0.39 (0.4)0.65
Total sleep time (TST)
 Min; mean (SD)535 (61)526 (41)0.28
TST supine %
 Mean (SD)43.3 (27.2)46.3 (22)0.67
REM (%)
 Mean (SD)18.8 (5.1)21.3 (4.9)0.35
Max % REM SAO2 desaturation
 Mean (SD)4.4 (2.5)6.2 (2.8)0.001**
Max % NREM SAO2 desaturation
 Mean (SD)4. 4 (2.5)4.7 (2.0)0.38
SAO2 (wake)
 Mean (SD)97.3 (1.4)97.2 (0.9)0.54
SAO2 (REM, average)
 Mean (SD)97 (1.0)97 (1.2)0.85
SAO2 (NREM, average)
 Mean (SD)96.8 (1.0)96.6 (1.2)0.28

For quantitative variables, data are presented as mean ± standard deviation (SD). SAO2: saturation of oxygen; REM: rapid eye movement; OAHI: obstructive apnea-hypopnea index. For categorical variables, data are presented as count number (column percentage). values are obtained by either two-sample -test or chi-square test, depending on the type of variables.
Statistically significant results are shown in bold font.