Table 3.
Correlations between CSHQ, PSG, and actigraphy variables.
| Variable | CSHQ |
PSG |
ACT |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SOD | SD | NW | SDB | SL | TST | WASO | RDI | SL | SM | WASO | |
| CSHQ_SOD | 1 | 0.13 | 0.26 | −0.09 | 0.31 | −0.07 | −0.05 | a | 0.02 | −0.11 | 0.20 |
| CSHQ_SD | 1 | 0.13 | 0.17 | 0.13 | −0.16 | 0.09 | a | 0.33 | 0.02 | −0.10 | |
| CSHQ_NW | 1 | 0.31 | −0.19 | −0.11 | 0.17 | a | −0.17 | −0.42* | 0.47** | ||
| CSHQ_SDB | 1 | −0.24 | −0.09 | 0.11 | a | 0.06 | 0.15 | −0.04 | |||
| PSG_SL | 1 | −0.23 | 0.11 | a | 0.16 | 0.25 | −0.32 | ||||
| PSG_TST | 1 | −0.80** | a | 0.03 | 0.28 | −0.28 | |||||
| PSG_WASO | 1 | a | 0.05 | −0.21 | 0.24 | ||||||
| PSG_RDI | a | a | a | a | |||||||
| ACT_SL | a | 1 | 0.06 | −0.26 | |||||||
| ACT_SM | a | 1 | −0.90** | ||||||||
| ACT_WASO | a | 1 | |||||||||
CSHQ, Children’s Sleep Habits Questionnaire; CSHQ_SOD, CSHQ Sleep Onset Delay; CSHQ_SD, CSHQ Sleep Duration; CSHQ_NW, CSHQ Night Wakings; CSHQ_SDB, CSHQ Sleep Disordered Breathing; PSG, polysomnography; PSG_SL, PSG Sleep Latency; PSG_TST, PSG Total Sleep Time; PSG_WASO, PSG Wake After Sleep Onset; PSG_RDI, PSG Respiratory Disturbance Index; ACT, actigraphy; ACT_SL, ACT Sleep Latency; ACT_SM, ACT Sleep Minutes; ACT_WASO, ACT Wake After Sleep Onset.
Significant values are shown in boldface. *p < 0.05, **p < 0.01.
aCannot be computed because PSG RDI variable is constant.