Does reading a book in bed make a difference to sleep in comparison to not reading a book in bed? The People’s Trial—an online, pragmatic, randomised trial

Table 2 What did sleep quality look like in the two groups (reading a book in bed and not reading a book in bed) at the end of the trial?

Sleep quality at the end of the trial	Reading group (n=369) n (%)	Not reading group (n=405) n (%)
• Terrible	1 (0.27%)	4 (0.99%)
• Poor	24 (6.50%)	42 (10.4%)
• Fair	104 (28.2%)	156 (38.5%)
• Good	218 (59.1%)	186 (45.9%)
• Excellent	22 (5.9%)	17 (4.25%)
Sleep disturbance⁴
Mean¹ (sd)²	46.7 (7.97)	49.9 (7.94)
Median (min, max)~	45.5 [28.9, 70.8]	50.1 [28.9, 73.0]
Daytime sleepiness⁵
Mean (sd)	6.86 (1.93)	6.15 (2.05)
Median³ (min, max)	7 [ 0, 10]	7 [0, 10]

¹Mean tells us the average sleep disturbance score indicated by people who took part in The Reading Trial
²The standard deviation (sd) tells us the amount of variability we found in the individual scores people reported for sleep disturbance compared to the mean score
³The median tell us what the ‘middle’ score was in the list of scores indicated by people when we asked them to score their daytime sleepiness after taking part in The Reading Trial
⁴We measured sleep disturbance using the PROMIS (Patient-Reported Outcomes Measurement Information System) Short Form Sleep Disturbance Scale (eight items each on a 5-point scale with a difference of one unit between each point on the scale)
⁵Daytime sleepiness’ was measured using a 10-point scale. The points on the scale increase in units of one

ISSN: 1745-6215