Table 1 Characteristics of participants included in data analysis at 5-, 10- and 14-month assessments.

5 month visit

Age in days

176 (20)

179 (14)

0.463^a

Number of awakenings

2.00 (1.48)

2.44 (1.47)

0.209^a

N

65

25

M:F

35:30

18:7

0.117^b

Sleep onset latency in min

12.42 (10.35)

11.15 (10.10)

0.604^a

N

65

24

M:F

34:31

17:7

0.117^b

10 month visit

Age in days

319 (15)

322 (17)

0.430^a

Number of awakenings

1.95 (1.37)

1.27 (1.08)

0.032 ^a

N

81

22

M:F

46:35

15:7

0.335^b

Sleep onset latency in min

11.45 (7.51)

7.92 (6.19)

0.041^a

N

82

22

M:F

46:36

15:7

0.307 ^b

Tactile Supression Index

− 0.009 (0.212)

0.141 (0.141)

0.008^a

N

51

17

M:F

24:27

10:7

0.401^b

14 month visit

Age in days

450 (19)

448 (18)

0.548^a

Number of awakenings

1.87 (1.46)

1.00 (1.45)

0.022 ^a

N

83

19

M:F

44:39

12:7

0.423^b

Sleep onset latency in min

13.18 (11.40)

6.46 (7.25)

0.002^a

N

84

19

M:F

45:39

12:7

0.448^b