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Table 2 Means and standard deviations for sleep measurements by group

From: Contributions of circadian tendencies and behavioral problems to sleep onset problems of children with ADHD

Measures ADHD N = 26 Control N = 49 F
Polysomnography    
 Sleep latency 27.48 (17.99) 20.57 (16.24) 1.32
 Total sleep time 519.20 (43.25) 518.84 (61.10) 0.09
 Sleep efficiency (%) 94.91 (3.89) 96.90 (2.84) 3.62
 Stage N1 (min) 27.50 (12.62) 22.55 (11.00) 1.47
 Stage N2 (min) 204.36 (48.45) 185.17 (50.00) 1.29
 Stage N3 (min) 201.73 (50.06) 224.01 (61.37) 1.82
 REM Sleep (min) 85.61 (21.12) 87.11 (23.03) 0.47
 PLM index 2.87 (1.82) 3.78 (1.24) 0.79
 AHI Index 0.84 (0.97) 1.15 (0.61) 0.51
Sleep Logs    
 Bedtime 21:13 (0:36) 21:14 (0:45) 0.30
 Wake-up time 7:16 (0:45) 7:20 (0:53) 0.05
 Sleep Duration 10:03 10:06 --
Morningness-Eveningness Scale 29.81 (4.56) 31.80 (3.32) 10.72*
Children’s Sleep Habits Questionnaire    
 Bedtime Resistance 8.23 (2.60) 7.58 (2.43) 1.81
 Sleep Onset Delay 1.71 (0.82) 1.42 (0.64) 3.98*
 Sleep Duration 5.16 (1.93) 4.34 (1.45) 5.88*
 Sleep Anxiety 6.10 (2.29) 5.23 (2.21) 4.06*
 Night Wakings 4.58 (2.0) 3.73 (1.15) 6.88**
 Parasomnias 9.06 (1.77) 8.27 (1.84) 3.57
 Sleep Disordered Breathing 3.45 (0.93) 3.19 (0.90) 1.45
 Daytime Sleepiness 13.71 (3.50) 11.81 (2.85) 8.07**
 Total Sleep Disturbance Score 48.97 (5.82) 42.97 (7.16) 17.36**
  1. Note. RLS refers to the Restless Leg Syndrome Index of the Pediatric Sleep Questionnaire; AHI refers to the apnea/hypopnea index. Children with primary sleep disorders were excluded from the study. *p ≤ .05. **p ≤ .001.