. 2019 Dec 20;2(12):e1918062. doi: 10.1001/jamanetworkopen.2019.18062

Table 4. Sleep Outcomes at Ages 6, 12, and 24 Months.

Outcome	Age
	6 mo			12 mo			24 mo
	Intervention Group	Control Group	P Value	Intervention Group	Control Group	P Value	Intervention Group	Control Group	P Value
Reported by Maternal Interview
No.	275	266		290	281		278	268
Sleep duration, mean (SD), h
Total	12.10 (2.13)	12.20 (2.13)	.60^a	11.65 (1.85)	11.55 (1.68)	.51^a	10.81 (2.07)	11.07 (1.96)	.12^a
Daytime	3.23 (1.61)	3.33 (1.78)	.45^a	3.22 (1.58)	3.03 (1.43)	.17^a	3.00 (1.58)	3.13 (1.45)	.28^a
Nighttime	8.99 (1.73)	8.98 (1.67)	.99^a	8.43 (1.35)	8.52 (1.35)	.47^a	7.61 (1.95)	7.88 (2.02)	.34^a
Nocturnal awakenings, median (IQR), No.	1.0 (1.0-3.0)	2.0 (1.0-3.0)	.09^b	1.0 (0-2.0)	0 (0-2.0)	.81^b	0 (0-1.0)	0 (0-2.0)	.53^b
Nocturnal wake time duration, median (IQR), h^c	0.42 (0.08-1.00)	0.50 (0.08-1.00)	.87^b	0.50 (0-1.50)	0.50 (0-1.50)	.81^b	0.50 (0-1.50)	0.50 (0-1.25)	.57^b
Reported by Diaries^d
No.	241	240		NA	NA		NA	NA
Sleep duration, mean (SD), h
Total	12.24 (2.01)	12.04 (2.29)	.33^a	NA	NA	NA	NA	NA	NA
Daytime	2.40 (1.05)	2.48 (1.10)	.40^a	NA	NA	NA	NA	NA	NA
Nighttime	9.80 (1.85)	9.49 (2.07)	.10^a	NA	NA	NA	NA	NA	NA
Nocturnal awakenings, median (IQR), No.	2.0 (1.0-2.7)	1.7 (1.0-2.7)	.90^b	NA	NA	NA	NA	NA	NA
Reported by Actigraphy^e
No.	202	214		198	197		189	194
Sleep duration, mean (SD), h
Total	11.52 (1.46)	11.46 (1.93)	.72^a	10.23 (1.79)	10.19 (1.75)	.81^a	10.22 (1.68)	10.18 (1.76)	.83^a
Daytime	2.73 (1,25)	2.78 (1.31)	.67^a	2.27 (1.16)	2.24 (1.11)	.82^a	1.92 (1.35)	1.73 (1.13)	.14^a
Nighttime	8.76 (1.32)	8.59 (1.33)	.22^a	7.99 (1.52)	8.02 (1.93)	.85^a	8.17 (1.42)	8.32 (1.39)	.33^a
Nocturnal awakenings, median (IQR), No.	2.3 (1.7-3.0)	2.0 (1.7-3.0)	.49^b	2.0 (2.0-3.0)	3.0 (2.0-4.0)	.20^b	2.0 (1.0-3.0)	2.0 (1.0-3.0)	.37^b
Nocturnal wake time duration, median (IQR), h^c^,^f	0.57 (0-1.18)	0.71 (0.07-1.51)	.18^b	0.91 (0-1.98)	1.10 (0-2.28)	.54^b	0.64 (0-1.58)	0.23 (0-1.55)	.16^b

Abbreviations: IQR, interquartile range; NA, not available.

^{^a}

Calculated with t test.

^{^b}

Calculated with Mann-Whitney test.

^{^c}

Nocturnal wake time defined as from 22:00 to 06:00.

^{^d}

Reported as a mean of 3 days.

^{^e}

Reported as a mean of 3 days at age 6 months and as 1 day of data at ages 12 and 24 months.

^{^f}

Nocturnal wake time measured after first sleep onset.