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Nulliparous Pregnancy Outcomes Study Monitoring Mothers-to-be

Name Label Folder
slpeff
Sleep Efficiency (%): the proportion of sleep duration in in-bed period
Sleep Efficiency (%): the proportion of sleep duration in in-bed period

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, while in-bed period is the interval between lights off/in-bed time and lights on/out-bed time. Conventionally, this variable could be described as the ratio between total sleep time (TST) and time in bed (TIB).

Polysomnography/Sleep Architecture
ttldursp
Total Sleep Duration: the interval between sleep onset time and lights on/out-bed time while the participant is asleep.
Total Sleep Duration: the interval between sleep onset time and lights on/out-bed time while the participant is asleep.

Total sleep duration does not include wake after sleep onset. Conventionally, this would be called total sleep time.

Polysomnography/Sleep Architecture
ttlprdbd
Total In-Bed Period: the interval between lights out/in-bed time and lights off/out-bed time.
Total In-Bed Period: the interval between lights out/in-bed time and lights off/out-bed time.

Conventionally this variable would be called time in bed

Polysomnography/Sleep Architecture
waso
Wake After Sleep Onset (WASO): the total duration between sleep onset and lights-on/out-bed time while being awake.
Wake After Sleep Onset (WASO): the total duration between sleep onset and lights-on/out-bed time while being awake. Polysomnography/Sleep Architecture
begtimbd
Clock time when the participant is in bed or lights are out
Clock time when the participant is in bed or lights are out Polysomnography/Sleep Architecture
begtimrd
Clock time when the recording (study) starts
Clock time when the recording (study) starts Polysomnography/Sleep Architecture
begtimsp
Sleep Onset: Clock time when the participant falls asleep
Sleep Onset: Clock time when the participant falls asleep Polysomnography/Sleep Architecture
endtimbd
Clock time when the participant is out of bed or lights are on
Clock time when the participant is out of bed or lights are on Polysomnography/Sleep Architecture
endtimrd
Clock time when the recording (study) ends
Clock time when the recording (study) ends Polysomnography/Sleep Architecture
pctdursp_pb
Percentage of sleep duration in supine position
Percentage of sleep duration in supine position Polysomnography/Sleep Architecture
pctdursp_po
Percentage of sleep duration in non-supine position
Percentage of sleep duration in non-supine position

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep

Polysomnography/Sleep Architecture
phrnumsf
Number of sleep to awake shifts per hour
Number of sleep to awake shifts per hour Polysomnography/Sleep Architecture
slplatency
Sleep Latency: the interval between lights-out/in-bed time and sleep onset time.
Sleep Latency: the interval between lights-out/in-bed time and sleep onset time. Polysomnography/Sleep Architecture
slpmaineff
Sleep Maintenance Efficiency (%): the proportion of sleep duration in sleep period
Sleep Maintenance Efficiency (%): the proportion of sleep duration in sleep period

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep, while sleep period is the interval between sleep onset time and lights on/out-bed time. Conventionally this variable would be described as the ratio between total sleep time (TST) and the sum of TST and wake after sleep onset (WASO).

Polysomnography/Sleep Architecture
ttldursp_pb
Total sleep duration (supine)
Total sleep duration (supine)

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep

Polysomnography/Sleep Architecture
ttldursp_po
Total sleep duration (non-supine)
Total sleep duration (non-supine)

Sleep duration is the interval between sleep onset time and lights on/out-bed time while asleep

Polysomnography/Sleep Architecture
ttlprdrd
Total Recording Period: the interval between recording start and end time.
Total Recording Period: the interval between recording start and end time.

Study length (epoch 1 to last epoch- minutes)

Polysomnography/Sleep Architecture
ttlprdsp
Total Sleep Period: the interval between sleep onset time and lights on/out-bed time
Total Sleep Period: the interval between sleep onset time and lights on/out-bed time

Total sleep period = total sleep duration + wake after sleep onset

Polysomnography/Sleep Architecture