Table 2 Control variables of nighttime sleep duration for infants.

From: Dependence of nighttime sleep duration in one-month-old infants on alterations in natural and artificial photoperiod

 

β

95% confidence interval

p

Lower

Upper

Univariate analysis

Season

 Winter

1.11

0.83

1.50

0.490

 Spring

1.54

1.17

2.03

0.002

 Summer

1.16

0.87

1.55

0.325

 Autumn

Reference

Room brightness

 Bright

1.14

0.89

1.47

0.303

 Dim

Reference

Light-off time for infants

 Regularly ≤ 21:00 h

2.19

1.62

2.96

<0.001

 Regularly >21:00 h

1.42

1.06

1.89

0.017

 Irregular

Reference

Daytime sleep duration for infants (h)

1.51

1.41

1.61

<0.001

Maternal nighttime sleep duration (h)

1.57

1.44

1.66

<0.001

Multivariate analysis

Season

 Winter

1.11

0.86

1.43

0.418

 Spring

1.37

1.07

1.75

0.011

 Summer

1.22

0.96

1.54

0.098

 Autumn

Reference

Light-off time for infants

 Regularly ≤ 21:00 h

1.83

1.42

2.35

<0.001

 Regularly > 21:00 h

1.36

1.08

1.72

0.010

 Irregular

Reference

Daytime sleep duration for infants (h)

1.46

1.38

1.54

<0.001

Maternal nighttime sleep duration (h)

1.45

1.36

1.55

<0.001

  1. Independent variables for infant nighttime sleep duration were assessed using a generalised linear model.
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