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. Author manuscript; available in PMC: 2022 Dec 1.
Published in final edited form as: Prev Med. 2021 Sep 22;153:106812. doi: 10.1016/j.ypmed.2021.106812

Table 1.

Descriptive statistics of sleep duration, sedentary behavior, physical activity, and covariates from the national longitudinal study of adolescent to adult health (add health; N = 9279).

Variables Full sample (N = 9279) Male sample (N = 3989) Female sample (N = 5290)
N Proportion or M (SE) N Proportion or M (SE) N Proportion or M (SE)
Sleep duration
 W1 sleep duration 7.75 (0.01) 7.79 (0.02) 7.72 (0.02)
  Short (e.g., 0–7 h for adolescents aged 13–18) 3550 0.38 1491 0.37 2059 0.39
  Optimal (e.g., 8–9 h for adolescents aged 13–18) 4877 0.53 2120 0.53 2756 0.52
  Long (e.g., 10+ hours for adolescents aged 13–18) 852 0.09 378 0.09 474 0.09
 W5 sleep duration 6.73 (0.01) 6.66 (0.02) 6.79 (0.02)
  Short (0–6 h) 3907 0.42 1772 0.44 2135 0.40
  Optimal (7–8 h) 4991 0.54 2093 0.52 2898 0.55
  Long (9+ hours) 380 0.04 123 0.03 257 0.05
Sedentary behavior
 W1 sedentary screen time (hours/week) 22.45 (0.22) 25.27 (0.36) 20.32 (0.28)
  0–7 h/week 2022 0.22 650 0.16 1372 0.26
  8–14 h/week 2200 0.24 874 0.22 1326 0.25
  15–21 h/week 1508 0.16 689 0.17 819 0.15
  22+ hours/week 3549 0.38 1776 0.45 1773 0.34
 W5 sedentary screen time (hours/week) 13.02 (0.14) 14.19 (0.23) 12.15 (0.17)
  0–7 h/week 3899 0.42 1466 0.37 2432 0.46
  8–14 h/week 2528 0.27 1136 0.28 1392 0.26
  15–21 h/week 1609 0.17 774 0.19 834 0.16
  22+ hours/week 1244 0.13 613 0.15 631 0.12
Physical activity
 W1 participation in team Club sports 5328 0.57 2480 0.62 2848 0.54
 W1 moderate to vigorous physical activity (times/week) 6.57 (0.04) 7.59 (0.07) 5.80 (0.05)
  0 times 506 0.05 158 0.04 348 0.07
  1–4 times 2773 0.30 896 0.22 1877 0.35
  5+ times 6000 0.65 2935 0.74 3065 0.58
 W5 moderate to vigorous physical activity (times/week) 4.45 (0.05) 5.19 (0.08) 3.88 (0.06)
  0 times 2227 0.24 723 0.18 1505 0.28
  1–4 times 3500 0.38 1469 0.37 2030 0.38
  5+ times 3552 0.38 1797 0.45 1755 0.33
Demographics
 W1 age 16.06 (0.02) 16.16 (0.03) 15.99 (0.02)
  Female 5290 0.57 0 0 5290 1.00
  US citizen 8690 0.94 3729 0.93 4961 0.94
Race/ethnicity
  Non-Hispanic white 5125 0.55 2292 0.57 2833 0.54
  Non-Hispanic black 1807 0.19 661 0.17 1146 0.22
  Hispanic 1328 0.14 573 0.14 755 0.14
  Non-Hispanic other 1019 0.11 463 0.12 556 0.11
W1 socioeconomic status
 W1 household income
  Less than $39,999 4464 0.48 1823 0.46 2641 0.50
  $40,000 to $74,999 3470 0.37 1555 0.39 1915 0.36
  $75,000+ 1344 0.14 610 0.15 734 0.14
 W1 highest education of parents
  Below high school 1002 0.11 386 0.10 616 0.12
  High school graduate to some college 4688 0.51 1968 0.49 2720 0.51
  College graduate or higher 3589 0.39 1635 0.41 1953 0.37
 W1 neighborhood safety 8270 0.89 3602 0.90 4668 0.88
W5 socioeconomic status
 W5 household income
  Less than $39,999 2306 0.25 813 0.20 1493 0.28
  $40,000 to $74,999 2277 0.25 1009 0.25 1268 0.24
  $75,000+ 4695 0.51 2167 0.54 2528 0.48
 W5 education
  Below high school 307 0.03 161 0.04 146 0.03
  High school graduate to some college 4959 0.53 2296 0.58 2662 0.50
  College graduate or higher 4013 0.43 1532 0.38 2481 0.47
 W5 home ownership 8085 0.87 3399 0.85 4686 0.89
 W5 employment 7864 0.85 3564 0.89 4300 0.81
W1 health behaviors
 W1 smoke 2197 0.24 950 0.24 1247 0.24
 W1 alcohol 2638 0.28 1203 0.30 1435 0.27
 W1 body mass index
  Underweight 272 0.03 129 0.03 144 0.03
  Normal weight/overweight 8028 0.87 3366 0.84 4662 0.88
  Obese 978 0.11 494 0.12 484 0.09
 W1 self-rated health
  Good, very good, or excellent 8722 0.94 3811 0.96 4911 0.93
 W1 physical limitation 246 0.03 104 0.03 142 0.03
W5 health behaviors
 W5 smoke 2160 0.23 1055 0.26 1105 0.21
 W5 alcohol 6767 0.73 3065 0.77 3703 0.70
 W5 body mass index
  Underweight 88 0.01 19 0.00 69 0.01
  Normal weight/overweight 5440 0.59 2441 0.61 2999 0.57
  Obese 3751 0.40 1529 0.38 2222 0.42
 W5 self-rated health
  Good, very good, or excellent 8071 0.87 3460 0.87 4610 0.87
 W5 chronic conditions 4878 0.53 2039 0.51 2840 0.54
 W5 physical limitation 438 0.05 147 0.04 290 0.05

Note. W1 = Wave I (Mage = 16), W5 = Wave V (Mage = 38).