Table 3:
Description of Subjective and Objective Measurements
| Variables | Means and SD | Normal Range |
|---|---|---|
| Sleep time needed by mothers to feel refreshed | 459 min (SD = 71) | 420–480 min |
| Subjective sleep | ||
| GSDS total scale | 2.7 (SD = 0.8) | <3 |
| Sleep quality | 3.9 (SD =1.9) | <3 |
| Daytime | 3.5 (SD =1.3) | <3 |
| functioning | ||
| Objective sleep and activity measured by wrist actigraph (2 days average) | ||
| Nighttime TST | 403 min (SEM = 20.1) | 420–480 min |
| Daytime TST | 69.5 min (SEM = 15.2) | <30 min |
| Sleep latency | 17 min (SEM = 2.8) | <15 min |
| Wake after sleep onset | 18.8% (SEM = 2.2%) | <10% |
| Duration of each awake time | 5.6 (SEM = 0.8) | |
| Amplitude | 90 (SD =19.7) | Not available |
| Mesor | 129.9 (SD = 20.2) | Not available |
| Acrophase (time format) | 16:44 (SD = 1:06) | 13:00–7:00 |
| Circadian quotient | 0.70 (SD = 0.14) | Not available |
| Depression | ||
| EPDS | 14.7 (SD = 5.6) | <10 |
| Fatigue (2 days average) | ||
| Morning | 3.7 (SD = 1.9) | <3.3 |
| Evening | 5.1 (SD = 1.5) | <3.3 |
| Medical outcomes | ||
| SF36v2PCS | −0.87 (SD = 0.9) | |
| SF36v2MCS | −1.26 (SD = 1.15) | |
| Light exposure | Office light level | |
| 12 hours’ average | 73 lux (SEM = 14) | 400–500 lx |
Note. EPDS 5 Edinburgh Postnatal Depression Scale, GSDS 5 General Sleep Disturbance Scale, SF36MCS 5 Medical Outcomes Short Form-36 version2-Mental Health Summary, SF36PCS 5 Medical Outcomes Short Form-36 version 2-Physi-cal Component Summary, TST 5 total sleep time.