Table 5 Risk Ratios for sleep spindle-estimated sleep onset times.

From: A randomized controlled trial of alpha phase-locked auditory stimulation to treat symptoms of sleep onset insomnia

 

Sham

Stimulation

# Subject-nights SOL > 30 min

34

18

# Total subject-nights

67

68

Event Rate

0.5075

0.2647

Absolute risk ratio (ARR)

–

0.2428

Relative risk ratio (RRR)

–

1.9717

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