Age

Visit vs Total duration of Stage 2 sleep from type II polysomnography
N Mean StdDev Median Min Max Unknown Total
Visit 1 2,911 219.8 ± 59.4 222.0 0.0 510.0 - 2,911
Visit 2 1,026 208.2 ± 68.3 210.0 0.0 488.0 1,885 2,911
Age at Sleep Visit 1 vs Total duration of Stage 2 sleep from type II polysomnography
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 2,911 219.8 ± 59.4 222.0 0.0 510.0 - 2,911
67.0 to 72.0 years 728 221.5 ± 57.0 225.5 0.0 510.0 - 728
72.0 to 76.0 years 728 218.5 ± 59.4 220.0 0.0 417.0 - 728
76.0 to 80.0 years 728 218.8 ± 58.7 220.0 0.0 363.0 - 728
80.0 to 90.0 years 727 220.5 ± 62.5 223.0 0.0 465.0 - 727
Gender vs Total duration of Stage 2 sleep from type II polysomnography
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 2,911 219.8 ± 59.4 222.0 0.0 510.0 - 2,911
Female - - - - - - - -
Male 2,911 219.8 ± 59.4 222.0 0.0 510.0 - 2,911
Gender vs Total duration of Stage 2 sleep from type II polysomnography
Visit 2
N Mean StdDev Median Min Max Unknown Total
Total 1,026 208.2 ± 68.3 210.0 0.0 488.0 1,885 2,911
Female - - - - - - - -
Male 1,026 208.2 ± 68.3 210.0 0.0 488.0 1,885 2,911
Race Category vs Total duration of Stage 2 sleep from type II polysomnography
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 2,911 219.8 ± 59.4 222.0 0.0 510.0 - 2,911
White 2,651 219.3 ± 59.2 222.0 0.0 465.0 - 2,651
African American 99 228.2 ± 76.9 227.0 0.0 510.0 - 99
Asian 85 220.7 ± 47.8 229.0 72.0 316.0 - 85
Native Hawaiian or Other Pacific Islander 3 171.3 ± 40.9 159.0 138.0 217.0 - 3
American Indian or Alaskan Native 1 230.0 - 230.0 230.0 230.0 - 1
Multiracial 30 240.9 ± 51.7 237.0 133.0 358.0 - 30
Unknown 42 220.0 ± 49.1 216.5 105.0 364.0 - 42
Race Category vs Total duration of Stage 2 sleep from type II polysomnography
Visit 2
N Mean StdDev Median Min Max Unknown Total
Total 1,026 208.2 ± 68.3 210.0 0.0 488.0 1,885 2,911
White 896 208.0 ± 68.1 209.0 0.0 488.0 1,755 2,651
African American 41 195.3 ± 85.1 207.0 0.0 347.0 58 99
Asian 49 213.5 ± 70.9 224.0 0.0 324.0 36 85
Native Hawaiian or Other Pacific Islander 3 186.7 ± 11.2 184.0 177.0 199.0 - 3
American Indian or Alaskan Native 1 237.0 - 237.0 237.0 237.0 - 1
Multiracial 14 219.1 ± 37.3 219.5 165.0 292.0 16 30
Unknown 22 224.5 ± 52.3 221.0 133.0 313.0 20 42