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. Author manuscript; available in PMC: 2022 Jul 1.
Published in final edited form as: J Adolesc Health. 2020 Nov 18;69(1):57–63. doi: 10.1016/j.jadohealth.2020.10.012

Table 1.

Mean ± SD (or %) of sleep duration, those not meeting sleep duration recommendations, and midpoint, according to categories of covariates in a sample of 384 Mexican youth

N Mean of sleep duration (hour) ± SD Did not meet sleep recommendations1, % Mean of Midpoint (decimal hour) ± SD
Weekday Weekend Weekday Weekend Weekdays weekends
Age, Quartiles
 Q1, 9.9 to 12.15y 96 8.53 ± 0.97 9.35 ± 1.16 67.71 36.46 3.29 ± 1.10 4.35 ± 0.99
 Q2, 12.15 to 13.54y 96 8.53 ± 1.20 9.22 ± 1.14 55.21 29.17 3.68 ± 1.42 4.49 ± 1.15
 Q3, 13.54 to 15.62y 96 8.40 ± 1.20 8.95 ± 1.14 34.38 17.89 3.63 ± 1.20 4.66 ± 1.21
 Q4, 15.70 to 17.96y 96 8.40 ± 1.39 8.80 ± 1.34 35.42 25.00 4.36 ± 1.32 5.24 ± 1.35
P Value 0.33 0.0005 <0.0001 0.03 <0.0001 <0.0001
Sex
 Male 188 8.40 ± 1.10 8.94 ± 1.20 50.53 32.09 3.77 ± 1.33 4.62 ± 1.27
 Female 196 8.52 ± 1.28 9.21 ± 1.22 45.92 22.45 3.71 ± 1.31 4.74 ± 1.18
P Value 0.34 0.032 0.36 0.03 0.67 0.34
Maternal Education
 8 y or less 42 8.39 ± 1.11 9.06 ± 1.21 50 28.57 3.79 ± 1.21 4.79 ± 1.40
 9 to 11 y 152 8.49 ± 1.19 9.10 ± 1.32 46.71 30.26 3.74 ± 1.38 4.68 ± 1.15
 12 y 134 8.52 ± 1.22 9.11 ± 1.19 44.78 21.80 3.73 ± 1.30 4.65 ± 1.27
 > 12 y 55 8.32 ± 1.26 8.93 ± 0.98 58.18 30.91 3.72 ± 1.31 4.69 ± 1.21
P value 0.76 0.59 0.39 0.37 0.82 0.68
Menarche status
 No 38 8.71 ± 1.03 9.43 ± 0.94 47.37 26.32 3.33 ± 1.14 4.49 ± 0.88
 Yes 156 8.47 ± 1.34 9.14 ± 1.27 45.51 21.79 3.81 ± 1.33 4.81 ± 1.24
P Value 0.31 0.18 0.84 0.55 0.04 0.13
Testicular Volume (>15mm)
 No 40 8.30 ± 0.83 9.01 ± 1.16 65.00 47.5 3.27 ± 0.91 4.09 ± 0.89
 Yes 142 8.45 ± 1.16 8.93 ± 1.23 45.77 26.95 3.87 ± 1.39 4.72 ± 1.31
P Value 0.44 0.74 0.03 0.01 0.01 0.005
MVPA (hours/wk), Quartiles
 Q1, 0 to 5.75 89 8.39 ± 1.27 9.16 ± 1.23 53.93 28.09 3.79 ± 1.28 4.83 ± 1.33
 Q2, 6 to 10 107 8.54 ± 1.24 9.09 ± 1.11 44.86 28.3 3.76 ± 1.36 4.83 ± 1.22
 Q3, 10.25 to 14.25 93 8.39 ± 1.22 8.94 ± 1.19 50.54 25.81 3.65 ± 1.40 4.56 ± 1.19
 Q4, 14.5 to 29 95 8.52 ± 1.05 9.11 ± 1.34 44.21 26.32 3.76 ± 1.23 4.51 ± 1.15
P Value 0.73 0.62 0.48 0.97 0.78 0.03
Ever smoked cigarettes
 No 317 8.46 ± 1.16 9.17 ± 1.16 50.16 26.27 3.59 ± 1.26 4.52 ± 1.13
 Yes 64 8.45 ± 1.36 8.69 ± 1.36 39.06 28.13 4.39 ± 1.37 5.42 ± 1.39
P Value 0.94 0.004 0.11 0.76 <0.0001 <0.0001
1

According to the American Academy of Sleep Medicine