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. Author manuscript; available in PMC: 2020 Jul 1.
Published in final edited form as: Behav Sleep Med. 2017 Nov 3;17(4):459–469. doi: 10.1080/15402002.2017.1395337

Table 2.

Baseline Sleep Characteristics

Total
(n=49)
Low-Dose
(n=23)
High-Dose
(n=26)
p-value
Average Sleep Parameters
    Bedtime (h:min) 10:54 PM 10:50 PM 10:57 PM 0.73
    Arising time (h:min) 7:03 AM 6:55 AM 7:10 AM 0.34
    TIB (min) 489.62 (47.43) 485.30 (44.37) 493.50 (50.54) 0.55
    TST (min) 441.36 (42.52) 440.0 (41.30) 442.60 (44.35) 0.84
    SOL (min) 5.27 (0.95) 5.08 (0.90) 5.44 (0.98) 0.19
    Activity counts (#) 30,989.65 (15,210.13) 29,001.80 (13,256.60) 32,748.10 (16,813.30) 0.40
    WASO (min) 42.99 (20.92) 40.18 (19.12) 45.48 (22.47) 0.38
    Number of awakenings (#) 14.20 (4.53) 13.51 (4.14) 14.80 (4.84) 0.32
Night-to-Night Variability (7-day SD)
    Bedtime (min) 57.20 (36.85) 63.37 (41.42) 51.73 (32.10) 0.27
    Arising time (min) 50.89 (27.11) 54.88 (32.41) 47.35 (21.42) 0.34
    TIB (min) 69.07 (45.26) 77.35 (51.49) 61.74 (38.48) 0.23
    TST (min) 63.31 (37.34) 68.78 (44.06) 58.48 (30.29) 0.34
    SOL (min) 1.36 (1.09) 1.19 (0.93) 1.50 (1.21) 0.31
    Activity counts (#) 13,423.87 (10321.29) 14,350.40 (11,817.70) 12,604.20 (8,952.60) 0.56
    WASO (min) 18.57 (9.96) 19.35 (9.70) 17.87 (10.32) 0.61
    Number of awakenings (#) 4.52 (1.70) 4.45 (1.79) 4.58 (1.65) 0.79
Night-to-Night Variability (CV)
    Bedtime 4.16 (2.69) 4.64 (3.12) 3.73 (2.21) 0.24
    Arising time 11.79 (5.38) 12.79 (6.25) 10.90 (4.42) 0.22
    TIB 14.12 (9.03) 15.81 (9.79) 12.62 (8.20) 0.22
    TST 14.47 (8.59) 15.63 (9.58) 13.44 (7.66) 0.38
    SOL 25.47 (18.90) 24.73 (21.64) 26.12 (16.51) 0.80
    Activity counts 42.45 (18.23) 47.80 (19.85) 37.72 (15.54) 0.05
    WASO 45.95 (16.85) 51.49 (17.22) 41.04 (15.20) 0.03
    Number of awakenings 34.10 (13.90) 34.48 (13.32) 33.77 (14.64) 0.86

Note. CV = coefficient of variation; SOL = sleep onset latency; TIB = total time in bed; TST = total sleep time; WASO = wake after sleep onset. Values presented are M (SD). P-values were obtained from t-tests, with statistical significance defined at the alpha < 0.05 level.

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