timest2 timest34
Name
timest2p
Label
Percentage of time stage 2
Description

Percent of sleep time in stage 2 [100*(number of minutes scored as stage 2) / (total sleep time)]

Calculation
timest2p = tmstg2p
Units
percent
Type
numeric
Visit Number vs Percentage of time stage 2
N Mean StdDev Median Min Max Unknown Total
Baseline 453 41.4 ± 7.7 41.7 15.6 61.0 - 453
Follow-up 407 43.7 ± 7.2 44.0 21.9 60.7 46 453
Age vs Percentage of time stage 2
Baseline
N Mean StdDev Median Min Max Unknown Total
Total 453 41.4 ± 7.7 41.7 15.6 61.0 - 453
5-7 yrs old 329 40.5 ± 7.7 40.7 15.6 61.0 - 329
8-10 yrs old 124 43.7 ± 7.1 44.6 26.9 60.4 - 124
Age vs Percentage of time stage 2
Follow-up
N Mean StdDev Median Min Max Unknown Total
Total 397 43.8 ± 7.2 44.1 21.9 60.7 2 399
5-7 yrs old 260 42.4 ± 7.0 42.7 21.9 59.0 2 262
8-10 yrs old 137 46.4 ± 6.7 46.5 26.3 60.7 - 137
Gender vs Percentage of time stage 2
Baseline
N Mean StdDev Median Min Max Unknown Total
Total 453 41.4 ± 7.7 41.7 15.6 61.0 - 453
Female 234 42.9 ± 7.5 43.2 15.6 61.0 - 234
Male 219 39.8 ± 7.5 39.3 18.5 61.0 - 219
Gender vs Percentage of time stage 2
Follow-up
N Mean StdDev Median Min Max Unknown Total
Total 407 43.7 ± 7.2 44.0 21.9 60.7 46 453
Female 209 44.9 ± 7.0 45.1 26.9 59.9 25 234
Male 198 42.5 ± 7.2 43.0 21.9 60.7 21 219
Race vs Percentage of time stage 2
Baseline
N Mean StdDev Median Min Max Unknown Total
Total 453 41.4 ± 7.7 41.7 15.6 61.0 - 453
Black 249 43.0 ± 7.1 42.4 19.5 61.0 - 249
White 156 39.8 ± 7.7 41.0 15.6 60.4 - 156
Other 48 38.4 ± 8.4 38.6 19.1 55.2 - 48
Race vs Percentage of time stage 2
Follow-up
N Mean StdDev Median Min Max Unknown Total
Total 407 43.7 ± 7.2 44.0 21.9 60.7 46 453
Black 217 44.3 ± 6.8 44.7 26.3 60.7 32 249
White 147 43.3 ± 7.6 43.9 21.9 59.9 9 156
Other 43 41.9 ± 7.1 43.3 28.9 59.0 5 48