Table 5 The differences between sleep category at 6 months and 12 months in predicting child working memory at 30 months

6 months

10th pc

10-90th pc

90th pc

Unadjusted model

Adjusted model

Mean (SD)^a

Mean (SD)^a

Mean (SD)^a

Statistics^b

Statistics^c

Night sleep duration

11.15 (4.12)

11.81 (3.39)

12.39 (3.66)

F(2,347) = 3.626, p = 0.028, Ƞ² = 0.020

F(7,334) = 2.019, p = 0.134, Ƞ² = 0.012

Day sleep duration

12.58 (3.18)

11.83 (3.59)

11.06 (3.78)

F(2,348) = 1.747 p = 0.176, Ƞ² = 0.010

F(7,335) = 1.495, p = 0.226, Ƞ² = 0.009

Total sleep duration

12.00 (3.66)

11.90 (3.55)

11.75 (3.47)

F(2,346) = 0.068, p = 0.934 Ƞ² = 0.000

F(7,333) = 0.298, p = 0.742, Ƞ² = 0.002

% daytime sleep

12.33 (3.60)

11.94 (3.46)

11.06 (4.11)

F(2,346) = 1.142, p = 0.320, Ƞ² = 0.007

F(7,333) = 0.822, p = 0.440, Ƞ² = 0.005

Night awakenings

10.91 (4.09)

11.91 (3.58)

12.33 (2.82)

F(2,342) = 0.477, p = 0.621, Ƞ² = 0.003

F(7,329) = 0.963, p = 0.383, Ƞ² = 0.006

Time awake / night

11.22 (3.50)

12.28 (3.23)

11.12 (4.19)

F(2,332) = 1.534, p = 0.217, Ƞ² = 0.009

F(7,320) = 1.879, p = 0.154, Ƞ² = 0.012

12 months

10th pc

10-90th pc

90th pc

Unadjusted model

Adjusted model

Mean^a

Mean^a

Mean^a

Statistics^b

Statistics^c

Night sleep duration

11.39 (4.03)

12.30 (3.22)

11.70 (3.57)

F(2,310) = 0.572, p = 0.565, Ƞ² = 0.004

F(7,298) = 0.972, p = 0.379, Ƞ² = 0.006

Day sleep duration

11.71 (3.87)

12.16 (3.46)

11.31 (3.98)

F(2,316) = 1.113, p = 0.330, Ƞ² = 0.007

F(7,304) = 1.123, p = 0.327, Ƞ² = 0.007

Total sleep duration

12.29 (3.58)

12.02 (3.56)

11.33 (3.70)

F(2,308) = 0.898, p = 0.409, Ƞ² = 0.006

F(7,297) = 2.020, p = 0.135, Ƞ² = 0.013

% daytime sleep

11.69 (3.72)

12.12 (3.49)

10.88 (4.07)

F(2,308) = 1.565, p = 0.211, Ƞ² = 0.010

F(7,297) = 2.075, p = 0.127, Ƞ² = 0.014

Night awakenings

12.82 (3.24)

11.91 (3.69)

11.61 (3.08)

F(2,304) = 2.038, p = 0.132, Ƞ² = 0.013

F(7,294) = 1.283, p = 0.279, Ƞ² = 0.009

Time awake / night

12.91 (3.05)

12.00 (3.60)

10.32 (3.82)

F(2,282) = 5.002, p = 0.007, Ƞ² = 0.034

F(7,271) = 4.731, p = 0.014, Ƞ² = 0.031*