Table 6 Baseline (Time 1) and endpoint (Time 2) descriptive statistics for outcome variables

ADHD T-score – Parent report

81.11 (9.17)

77.78 (10.11)

− 3.33 (7.33) ^a

− 8.97–2.30

ADHD T-score – Self report

67.89 (13.11)

67.00 (15.87)

−.89 (8.10) ^a

− 7.12–5.34

ADHD T-score – Teacher report

74.50 (12.95)

70.75 (14.26)

− 3.75 (11.56) ^a

− 13.41–5.91

Delayed Match to Sample accuracy

81.11 (14.53)

77.22 (14.60)

− 3.89 (20.73) ^b

− 19.83–12.05

Delayed match to sample reaction time (ms)

4434.63 (1346.43)

4452.36 (1483.63)

17.73 (1114.71) ^a

− 839.11–874.57

Actigraphy – Sleep duration

601.13 (44.27)

577.57 (53.13)

− 23.56 (52.07) ^c

− 63.58–16.47

Actigraphy – Mean activity during sleep

19.52 (5.66)

18.72 (6.40)

−.80 (3.32) ^a

− 3.35–1.75

Actigraphy – Min spent awake during down period

116.34 (56.78)

100.62 (59.74)

− 15.72 (26.82) ^a

− 36.34–4.90

Actigraphy – Sleep efficiency (%)

84.92 (7.89)

86.40 (8.65)

1.48 (3.76) ^b

− 1.41–4.37

Actigraphy – Sleep onset latency

14.04 (5.83)

13.38 (6.74)

−.66 (4.13) ^a

− 3.83–2.52

Actigraphy – Min awake after sleep onset

87.17 (49.60)

78.44 (55.28)

− 8.73 (21.36) ^a

− 25.15–7.70

Actigraphy – Sleep fragmentation index

6.01 (2.24)

5.83 (1.98)

−.17 (1.79) ^a

− 1.55–1.20

Actigraphy – Daytime activity

242.44 (23.45)

251.93 (18.28)

9.49 (12.98) ^c

−.49–19.46

Child Sleep Habits (CSHQ-A) (parent-report)

44.11 (7.83)

44.44 (10.81)

.33 (7.70) ^a

− 5.58–6.25

Sleep self-report (SSR)

36.67 (6.67)

37.56 (6.21)

.89 (3.76) ^a

− 2.00–3.78

Gastrointestinal symptoms (GSRS)

1.44 (.51)

1.50 (.58)

.06 (.50) ^a

−.33–.44

Alpha diversity (H)

5.64 (0.63)

5.77 (0.48)

.13 ^c

− 0.73–0.98