Table 1 Participant characteristics stratified by sex

From: Afternoon to early evening bright light exposure reduces later melatonin production in adolescents

Variable

Female, n = 11a

Male, n = 11a

Age [years]

15.82 (1.25)

16.00 (1.10)

Self-reported pubertal stage (Tanner)

  

 Early pubertal

0 (0%)

1 (9.1%)

 Midpubertal

1 (9.1%)

4 (36%)

 Late pubertal

5 (45%)

6 (55%)

 Postpubertal

5 (45%)

0 (0%)

Chronotype (MSFsc)

3.85 (0.85)

3.82 (0.85)

Agreed habitual bedtime [hours]

22.30 (0.66)

22.20 (0.31)

Agreed habitual wake time [hours]

6.74 (0.48)

6.70 (0.37)

Time outdoors on free days [hours]

3.25 (1.42)

3.73 (1.46)

Time outdoors on school days [hours]

2.10 (0.77)

2.00 (1.07)

Body Mass Index (BMI)

21.36 (2.18)

22.08 (3.14)

PSQI score

3.18 (1.08)

3.09 (1.22)

Season

  

 Spring

5 (45%)

4 (36%)

 Summer

2 (18%)

1 (9.1%)

 Autumn

1 (9.1%)

2 (18%)

 Winter

3 (27%)

4 (36%)

  1. Summary of main participant characteristics, stratified by sex. Age, pubertal stage, chronotype (via the short MCTQ155), time spent outdoors and PSQI170 score were based on self-report measures collected at the screening and as part of the sleep diary. Habitual bedtimes and wake-up times were agreed during the in-person screening. Season (metrological) was based on participants’ dates of participation, while body mass index was based on in-person measurements of height and weight. Numerical variables are presented as 'mean (SD)', while categorical variables are presented as 'n' (%). Abbreviations: AEE afternoon to early evening, BMI body mass index, MCTQ Munich Chronotype Questionnaire, MSFSC midpoint of sleep on free days corrected for 'oversleep', PSQI Pittsburgh Sleep Quality Index.
  2. aMean (SD); n (%).
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